Some players are almost compulsive about disguising their hands. Even if there is little logical benefit in fooling you at the moment, they may still give it a try. When a player who normally doesn't indicate how many he'll draw until it's his turn suddenly decides to let you know he needs cards, there's a good chance he'll end up rapping pat. The reason this tell has a fairly low dollar value is because there's very little you can do to capitalize. If you're the opener with a pair of queens, you're going to have to draw three anyway (unless you can split openers and try for a straight or flush). You can gain some ground by knowing that your opponent will probably never rap pat now unless he has a complete hand. He feels that he's made you suspicious and more likely to call by requesting a card and then changing his mind.
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You're playing poker with the joker and have asked for one card. You hold Ace of Clubs, Joker, 2 of Clubs, 2 of Diamonds, 8 of Clubs. You should consider throwing away the 2 of Diamonds and trying for the flush. Even this has disadvantages, because your opponent may have a pat full house and you'll end up drawing dead. If you've asked for three cards to a pair of kings, there's very little you can do at this point. If you make three kings and your opponent raps pat, you should not call when he subsequently bets.
