diff --git a/doc/source/commands.rst b/doc/source/commands.rst
index f28f992f..054f6ccd 100644
--- a/doc/source/commands.rst
+++ b/doc/source/commands.rst
@@ -218,6 +218,13 @@ These commands work in *any* tab.
     /invitations
         Show the pending invitations.
 
+   /impromptu
+        **Usage:** ``/impromptu <jid> [jid ..]``
+
+        Invite specified JIDs into a newly created room.
+
+       .. versionadded:: 0.13
+
     /activity
         **Usage:** ``/activity [<general> [specific] [comment]]``
 
@@ -472,6 +479,14 @@ Normal Conversation tab commands
         Get the software version of the current interlocutor (usually its
         XMPP client and Operating System).
 
+   /invite
+        **Usage:** ``/invite <jid> [jid ..]``
+
+        Invite specified JIDs, with this contact, into a newly
+        created room.
+
+       .. versionadded:: 0.13
+
 .. _rostertab-commands:
 
 Contact list tab commands
diff --git a/doc/source/configuration.rst b/doc/source/configuration.rst
index 6baa6a27..da6d7954 100644
--- a/doc/source/configuration.rst
+++ b/doc/source/configuration.rst
@@ -81,6 +81,15 @@ and certificate validation.
         you know what you are doing, see the :ref:`ciphers` dedicated section
         for more details.
 
+    default_muc_service
+
+       **Default value:** ``[empty]``
+
+       If specified, will be used instead of the MUC service provided by
+       the user domain.
+
+       .. versionadded:: 0.13
+
     force_encryption
 
         **Default value:** ``true``
diff --git a/poezio/config.py b/poezio/config.py
index a1f3dd49..d5a81c0e 100644
--- a/poezio/config.py
+++ b/poezio/config.py
@@ -49,6 +49,7 @@ DEFAULT_CONFIG = {
         'custom_host': '',
         'custom_port': '',
         'default_nick': '',
+        'default_muc_service': '',
         'deterministic_nick_colors': True,
         'device_id': '',
         'nick_color_aliases': True,
diff --git a/poezio/core/commands.py b/poezio/core/commands.py
index 5c8199c0..86df9a93 100644
--- a/poezio/core/commands.py
+++ b/poezio/core/commands.py
@@ -6,6 +6,7 @@ import logging
 
 log = logging.getLogger(__name__)
 
+import asyncio
 from xml.etree import cElementTree as ET
 
 from slixmpp.exceptions import XMPPError
@@ -763,6 +764,24 @@ class CommandCore:
         self.core.invite(to.full, room, reason=reason)
         self.core.information('Invited %s to %s' % (to.bare, room), 'Info')
 
+    @command_args_parser.quoted(1, 0)
+    def impromptu(self, args: str) -> None:
+        """/impromptu <jid> [<jid> ...]"""
+
+        if args is None:
+            return self.help('impromptu')
+
+        jids = set()
+        current_tab = self.core.tabs.current_tab
+        if isinstance(current_tab, tabs.ConversationTab):
+            jids.add(current_tab.general_jid)
+
+        for jid in common.shell_split(' '.join(args)):
+            jids.add(safeJID(jid).bare)
+
+        asyncio.ensure_future(self.core.impromptu(jids))
+        self.core.information('Invited %s to a random room' % (' '.join(jids)), 'Info')
+
     @command_args_parser.quoted(1, 1, [''])
     def decline(self, args):
         """/decline <room@server.tld> [reason]"""
diff --git a/poezio/core/completions.py b/poezio/core/completions.py
index b283950e..87bb2d47 100644
--- a/poezio/core/completions.py
+++ b/poezio/core/completions.py
@@ -289,6 +289,19 @@ class CompletionCore:
             return Completion(
                 the_input.new_completion, rooms, n, '', quotify=True)
 
+    def impromptu(self, the_input):
+        """Completion for /impromptu"""
+        n = the_input.get_argument_position(quoted=True)
+        onlines = []
+        offlines = []
+        for barejid in roster.jids():
+            if len(roster[barejid]):
+                onlines.append(barejid)
+            else:
+                offlines.append(barejid)
+        comp = sorted(onlines) + sorted(offlines)
+        return Completion(the_input.new_completion, comp, n, quotify=True)
+
     def activity(self, the_input):
         """Completion for /activity"""
         n = the_input.get_argument_position(quoted=True)
diff --git a/poezio/core/core.py b/poezio/core/core.py
index eec0d49b..2ab34412 100644
--- a/poezio/core/core.py
+++ b/poezio/core/core.py
@@ -13,12 +13,16 @@ import pipes
 import sys
 import shutil
 import time
+import uuid
 from collections import defaultdict
-from typing import Callable, Dict, List, Optional, Tuple, Type
+from typing import Callable, Dict, List, Optional, Set, Tuple, Type
+from xml.etree import cElementTree as ET
+from functools import partial
 
 from slixmpp import JID
 from slixmpp.util import FileSystemPerJidCache
 from slixmpp.xmlstream.handler import Callback
+from slixmpp.exceptions import IqError, IqTimeout
 
 from poezio import connection
 from poezio import decorators
@@ -868,6 +872,85 @@ class Core:
         self.xmpp.plugin['xep_0030'].get_info(
             jid=jid, timeout=5, callback=callback)
 
+    def _impromptu_room_form(self, room):
+        fields = [
+            ('hidden', 'FORM_TYPE', 'http://jabber.org/protocol/muc#roomconfig'),
+            ('boolean', 'muc#roomconfig_changesubject', True),
+            ('boolean', 'muc#roomconfig_allowinvites', True),
+            ('boolean', 'muc#roomconfig_persistent', True),
+            ('boolean', 'muc#roomconfig_membersonly', True),
+            ('boolean', 'muc#roomconfig_publicroom', False),
+            ('list-single', 'muc#roomconfig_whois', 'anyone'),
+            # MAM
+            ('boolean', 'muc#roomconfig_enablearchiving', True),  # Prosody
+            ('boolean', 'mam', True),  # Ejabberd community
+            ('boolean', 'muc#roomconfig_mam', True),  # Ejabberd saas
+        ]
+
+        form = self.xmpp['xep_0004'].make_form()
+        form['type'] = 'submit'
+        for field in fields:
+            form.add_field(
+                ftype=field[0],
+                var=field[1],
+                value=field[2],
+            )
+
+        iq = self.xmpp.Iq()
+        iq['type'] = 'set'
+        iq['to'] = room
+        query = ET.Element('{http://jabber.org/protocol/muc#owner}query')
+        query.append(form.xml)
+        iq.append(query)
+        return iq
+
+    async def impromptu(self, jids: Set[JID]) -> None:
+        """
+        Generates a new "Impromptu" room with a random localpart on the muc
+        component of the user who initiated the request. One the room is
+        created and the first user has joined, send invites for specified
+        contacts to join in.
+        """
+
+        results = await self.xmpp['xep_0030'].get_info_from_domain()
+
+        muc_from_identity = ''
+        for info in results:
+            for identity in info['disco_info']['identities']:
+                if identity[0] == 'conference' and identity[1] == 'text':
+                    muc_from_identity = info['from'].bare
+
+        # Use config.default_muc_service as muc component if available,
+        # otherwise find muc component by disco#items-ing the user domain.
+        # If not, give up
+        default_muc = config.get('default_muc_service', muc_from_identity)
+        if not default_muc:
+            self.information(
+                "Error finding a MUC service to join. If your server does not "
+                "provide one, set 'default_muc_service' manually to a MUC "
+                "service that allows room creation.",
+                'Error'
+            )
+            return
+
+        nick = self.own_nick
+        localpart = uuid.uuid4().hex
+        room = '{!s}@{!s}'.format(localpart, default_muc)
+
+        self.open_new_room(room, nick).join()
+        iq = self._impromptu_room_form(room)
+        try:
+            await iq.send()
+        except (IqError, IqTimeout):
+            self.information('Failed to configure impromptu room.', 'Info')
+            # TODO: destroy? leave room.
+            return None
+
+        self.information('Room %s created' % room, 'Info')
+
+        for jid in jids:
+            self.invite(jid, room)
+
     def get_error_message(self, stanza, deprecated: bool = False):
         """
         Takes a stanza of the form <message type='error'><error/></message>
@@ -1788,6 +1871,13 @@ class Core:
             desc='Invite jid in room with reason.',
             shortdesc='Invite someone in a room.',
             completion=self.completion.invite)
+        self.register_command(
+            'impromptu',
+            self.command.impromptu,
+            usage='<jid> [jid ...]',
+            desc='Invite specified JIDs into a newly created room.',
+            shortdesc='Invite specified JIDs into newly created room.',
+            completion=self.completion.impromptu)
         self.register_command(
             'invitations',
             self.command.invitations,
diff --git a/poezio/core/handlers.py b/poezio/core/handlers.py
index 0e655d68..b87e7307 100644
--- a/poezio/core/handlers.py
+++ b/poezio/core/handlers.py
@@ -97,6 +97,11 @@ class HandlerCore:
         self.core.xmpp.plugin['xep_0030'].get_info(
             jid=self.core.xmpp.boundjid.domain, callback=callback)
 
+    def find_identities(self, _):
+        asyncio.ensure_future(
+            self.core.xmpp['xep_0030'].get_info_from_domain(),
+        )
+
     def on_carbon_received(self, message):
         """
         Carbon <received/> received
diff --git a/poezio/tabs/conversationtab.py b/poezio/tabs/conversationtab.py
index 7e7a7488..94f1d719 100644
--- a/poezio/tabs/conversationtab.py
+++ b/poezio/tabs/conversationtab.py
@@ -79,6 +79,12 @@ class ConversationTab(OneToOneTab):
             ' allow you to see his presence, and allow them to'
             ' see your presence.',
             shortdesc='Add a user to your roster.')
+        self.register_command(
+            'invite',
+            self.core.command.impromptu,
+            desc='Invite people into an impromptu room.',
+            shortdesc='Invite other users to the discussion',
+            completion=self.core.completion.impromptu)
         self.update_commands()
         self.update_keys()