Worst play you've ever lost to in a home game...

This play didn't happen to me but happened at a tournament I had organized. 12 people left out of 18 starting. One friend across the table raises with AA, 3 callers. Flop comes AJ2. Player to my left bets, one caller, then original raiser goes all in. Player to my left calls him with 36o. Turn 5, river 4.

A few hands later he knocks me out with a river flush and later goes on to win the tournament. Some days you can do nothing wrong apparently...