Ah, the Chip on Your Shoulder Costume. Halloween garb that's as tasty as it is punny, and made especially for those like myself who aren't into the whole dress-up thing, and don't put much thought into what we're going to wear to a costume party until a couple days before. Or, uh, a couple hours.
 
In which case, you might not have time to order Duel Design Shop's Chip on Your Shoulder Costume, but considering the whole thing is just 1 giant potato chip with a safety pin for attaching it to your Emo Football T-Shirt, you could DIY the costume with a nice Dorito and some Gorilla Glue.