what is the craziest thing you done

i dated a girl
she introduced me to her brother (he started to make moves on me first)
i cheated on her with her brother, and this went on for months
i eventually left her for her brother, just a bit before she found out, and i ultimately ruined their relationship, especially since she wanted me away from him, and he decided to stay with me
worst/craziest thing ive ever done, still beat myself up over it

Biggest error I've done : eating an ice-cream in a thin "pancake" (don't remember what that was) and barely survived while eating it
what's the craziest thing you done?
it can be crazy,weird and romantic if it is