No Card Show
:ridinghor First, you did not pay to see his cards if you won, he paid to see yours.
Second, by showing you his cards he shows everyone else at the table his cards, which is free info for them since they weren't involved in the showdown.
Third, Be gracious. If the guy was on a draw or attempted to
bluff, and got caught, let him pay you and get to the next hand. There's no need to rub his face in it. Seeing his cards wont change the fact that you won or can it?
Once, at a house game the button showed top two pair, the Big Blind, who showed down with the button said, "Beats me." The button asked to see his cards...the big blind turned over the winning hand. He had misread the board and caught a straight. If the button hadnt asked to see his cards he would've gotten the pot.
The are only two times cards have to be shown. One is in a tourny and someone moves all-in. second, when you go to take the pot. Thats all.