Costume Ideas for a Halloween Party?

k I'm 15 and a GUY and i'm not sure what to be for my friend's Halloween party. its like the biggest party coming up and im not sure what i want to be. I've thought about being a bear (friends call me JERBEAR) or actually i was going to be hugh hefner and my best bud was goin to be a bunny. haha or the other way around. idk. help please?