if u have an obv monster hand but don't act on it with bets. If you mock ur opponent intentionally or unintentionally whil slow playing in a live tourney you may see that person in the parking lot - and he'll slow play on yer face....its about the rudest thing a poker player can do....If you do this on the river with lets say 3 players left and yer Heads up its actually a penalty/infraction. because it looks like ur giving free chips to an opponents to keep them in - collusion.