This one's called 3-5-7. They play it at the bust-out-table during a tourny.

Everyone ante's $1 (or whatever) to the center, then places (3) $1 bills or chips in front of them.

Your delt 3 cards. During this round 3's are wild. You have the option of showing down or not. If you showdown, you and the others at the showdown show your cards to each other only (those not in the showdown can't see) and decide between yourselves who has the best hand. Straights count but flushes do not. The winner takes the pot money from the middle ($1 for all playing) and the loser(s) have to put in another $1.

If no one shows down, the last person to act gets to take back $1 from the money in front of him.

Next round you get 2 more cards for a total of 5. This round, 5's are wild. Again, everyone has an option of staying in or going out. Again, at the showdown, only those who stay in see the cards. Winners take the pot, losers put in. Now flushes also apply.

Last round, 2 more cards for a total of 7 and 7's are wild. Everything goes as before, except all show down.

The game goes on until one person has taken back all the money in front of him.