My boyfriend and I are part of a rather kinky group and someone came up with the idea of a kink lottery. The rules are quite simple. We flip a coin at the beginning of the evening to see, if the boys or girls are in charge. After that the winners write down kinks and the loser groups draws from the lottery hat.
After some fun night where the boys always won, they came up with the idea of an extreme night. No limits allowed. We girls agreed thinking the luck will turn and it actually did. Because I found out that my BF used a fake coin and I could switch it.

We girls were a bit pissed, so we decided to write down castration on our papers. The look on the boys faces were priceless. But now my BF is really pissed and called me an Asshole for actually cutting his ball off. The other girls just pretended to do it.
I think he shouldn't have cheated, but maybe I overreacted.