Daddy Roulette
Guys drink until they pass out, then they all try to knock up the same girl. She gets a paternity test, but she can only pick one guy to be the dad because of some weird contract.
My buddy got stuck with the dad role because he was the only one who passed out and had sex with the girl.
My cousin signed a contract and got stuck with the dad role even though he didn't have sex with the girl.
My uncle had sex with the girl, but he got stuck with the dad role because he signed a contract.