I have never heard this rule before but my cousin swore it is real:
When a Texas Hold Em Tournament is down to only two players, each player is dealt their first two cards. If one of the players goes All IN immediately after receiving the preflop and the 2nd player goes ALL IN as well, are no more cards flopped and the entire bet rides on who's two cards in hand are better?
I was always under the impression that the rest of the cards had to be flopped and the person with the best 5 card hand wins.