You have to remember the fundamentals of Hold Em. In this game, there are 5 community cards "the board" that everyone shares. So if I have an ace or two of my own, and I am sharing with the rest of the players in the hand, it is possible to have more than 4 aces. You have to have at least 3 aces on the board for anyone to have 5 aces though. No trick decks and no jokers, just a very rare situation!!! Good Luck!!!