Dad Roulette is when a husband invites his friends to gangbang his wife, all giving her a creampie. To maximize randomness, a funnel is placed in the wifes vagina and all the friends, and the husband, fill it up at once.
"I'm finally pregnant, but I don't know the father because of the dad roulette we did" says the wife. "John had the largest load, so its probably John" replies the husband.
