Showing One Card (after everyone has folded)

[JackInDaCrak]

At a home game, I raised some girl off of her AQ on a Qxx board, and I showed my Q. Her boyfriend reached over and flipped my 2nd card from the muck, claiming the "show one show all" rule. I almost got in a fistfight with him over this exact situation.

IMO this is NOT the spirit nor the letter of that rule. If they want to see cards that you don't want them to see, they have to pay for it.