I was playing in a $30 single-table tournament a while back, and I got dealt a decent hand-pocket sixes. There was about eight of us left in the tournament and I was at about 700 chips. Four of us stayed in. One guy threw in the minimum raise and I called. The flop came up Ace-Six-Six. I flopped four of a kind! The guy who raised bet 200. I went all in. He called. Next two cards were a three and an Ace. I've won, right? Nope, he throws up pocket aces to give him a higher four of a kind on the river! That one will haunt me forever.