/sound (bell, gong, laugh, knock, crash, moo, flush) to make whatever sound you want.
/join #newroom Create a new room or join an existing room
/action message Sends an action (red) message
/whois nick Shows you information about this nickname
/topic new topic Changes the topic (if allowed)
/list Updates the room list
/quit Leave the chat and disconnect from the server
/msg or /query
Allows you to private message someone when followed by their nickname.