Way too many serious suggestions on forum right now. How about something more lighthearted!
/moves
"Captain-Falcon strikes a pose. Show me your moves!"
Your knight strikes a pose (could just do the salute)
Suggestion for (yet another) emote
Wed, 06/15/2011 - 15:05
"Leafy-papercraft is frightened!"
"{insert name} is scaring Leafy-papercraft!"
By the way, there is already /dance.