Don’t call at the end of a hand to ‘keep someone honest’.

This one follows the last tip. I see a lot of players look at another player’s final bet, look at the hand, and say ‘I know you’ve got me, but I have to keep you honest,’ as they throw in a final call. It may be worth it to see if a player really has the hand if you’re not sure and you’re gaining information that will help you later on, but if you really feel a player has the hand he’s representing and you’re beat, why give him another pile of your money? Those bets will add up over an evening.