A bunch of monsters show up to this Halloween party, hoping to eat some folks, or whatever it is that monsters do. However, once they get there, they realise that there are no people, just monsters. So there they are, too embarassed to leave, but too snobby to talk to each other. It ends up seeming like some weird highsociety event, filled with awkward small talk, hors d’œuvres nobody wants, and bad 90's pop picked by the host, a vampire who has an obnoxious laugh and bad manners. Our friend the raptor here, must be outside, having a smoke, trying to ignore the bothersome ghoul who is trying to ask about his stock choices.
....
....Or something like that.
-Edit- He might also be annoyed because Freaky Stella [link] showed up, and she makes his hair look bad.