I heard that years ago, Phil Helmuth used to do this in the WSOP. He would move all-in on a big pot, just to win the pot. He didn't want to get called and lose to a worse hand outdrawing him. I think one time he moved all-in and the other guy was thinking for some time. Phil flips over AA and the other guy folds. Phil showed, because in a tournament you want to win the most chips. The WSOP then changed their rules to prevent this.