[Don't look now but there's loud, mechanized breathing behind you. Or do look, because Darth Vader is looking over your shoulder. And he has a pretty realistic looking (if utterly not dangerous) lightsaber too, that makes all the sounds. Not perfect, because short notice, but Tony Stark is never one to disappoint.]
[Tony is only at the party for the beginning, long enough to nab a few drinks and hopefully freak out a few people. He ducks out early because -- well, you'll see later on~]