Then the flop came as 10, jack, queen. Everybody's betting and he stayed in. Then on the turn another 10 came out. The river came up as a third 10. The pot is getting huge.
People have straights and flushes and full houses all over the place.
But now this guy is stuck. So, before the final round of betting starts, he holds up his pocket cards and shows just one of the tens. He acts like he's doing a favor for the entire table, letting everybody know that he's got the hand won with four of a kind and they should save their money. So he just takes his chips and leaves. Then, four hands later, the extra 10 is found.