You could go as a BARBIE DOLL (or fill in similar sterotype). Get a long blonde wig, lot of make up, lot of cleavage long finger nails, a pink dress, a beauty mark, nice jewelry and then act like a plastic, hollow, superficial bitch!
I think Arael's right, you should dress like him. I'm not sure how well it'd fit but damn, that'd be amusing.
John Waters totally counts. But that means I need to include Josh Whedon, of course.