its a running pot that pays when a really bad beat happens for example....
in Texas hold 'em there is usually a requirement that both hole cards play in both the losing and winning hands, or that where a full house is the minimum (usually aces full of jacks or higher), both hole cards must be used to make the three-of-a-kind in the full house.
Bad beat jackpots are usually progressive, often with a small rake being taken out of each pot to fund the jackpot (in addition to the regular rake). When a jackpot is won, it is usually split among all players sitting at the table at the time of the bad beat with the losing hand getting the largest share, followed by the winning hand, and all the other players dividing the remainder. Generally, only the best losing hand is eligible to win the largest share, even if another hand would also qualify.
at gemeni i have seen several of these go off for 2-3000....not at my table though