Here--let me show you a card so you know you are ahead...

[bav]

New one tonight. It's heads-up on the river with a board something like 389T3 and player A bets $40 into a $50ish pot. Player B goes all in and has player A covered for about $240 more. Player A goes into the tank. After a minute player B helpfully says "here...I'll show you one...pick a card". Player A perks up and says "that one". Good to his word, B turns over that card revealing a 5--a card which cannot be of any value whatsoever. Player A does a double take and happily says "I call" and turns over Q3 beating his opponent's 53.

This must be some new sorta strategy they teach in one of the poker books I haven't read yet.