My university RPG society has a Halloween thing going on, and I'm probably going to dress up as my female Halfling rogue from D&D (I'm a 6'5" bloke, so shoes on knees and a wig will be a must

)
Either that or I'm gathering 3 other people and dressing up as the Left 4 Dead survivors (From either 1 or 2)
EDIT: Or maybe Michael Rosen... Now that would be scary...