Related to this thread. the other night a guy at the final table moved all in and did not hear a person call, he thought he had won uncontested and mucked his cards. What should have been the ruling?
In a tournaments, I believe accidental exposure of cards does not result in them being declared dead.
Consistently doing it or if it was done deibrately results in a time penalty though.
The hand stands, he's all-in, there's a call. Deal out the cards and see who wins.
In a cash game exposing cards prematurely kills the hand though. Subject to what Karabiner said about "the spirit of the game"