I've heard that if your cards, as you filp them up to show what you have, touches any of the community cards it's considered a fold regardless of what you have. I'm sure in a home games and some charity tournaments don't enforce this but some say casinos are very strict on this rule.:argh:
I believe it's the muck pile, not the community cards. Any card which touches the muck pile is considered a dead card. Not sure if that applies to the end of the hand at the showdown. Perhaps someone who plays in casinos a lot can clarify.
Believe me if i lost a winning hand cuz it touched a folded card the dealer would have to call the pit boss over and I'd probly be tossed out on my head with broken knuckles