[pfapfap]

I can think of three times I've done this. The worst was when I tabled half of a PLO hand to show how I got rivered, then mucked, and as the board was being cleared, someone said "flush", at which point I retrieved my hand and tabled it. This was at a drunken stoned home game, so things were fuzzy all around. It was a rather large pot, and I first said "chop?" and then quickly regretted it, conceeding the pot. Later the next day the guy found me and gave me half, which I felt was unnecessary (but appreciated).

Two times I've folded what I realized were backdoor winners as the cards were leaving my hand, but I let them go.