I lost a bunch when my power went out. So, just one more until later.
Jacks or Better, Trips to Win
We used to play this one with a 25c ante with no-limit betting between tournaments at a weekly live game. It creates lots of action. It's a 5 card draw variation.
First, it plays like standard Jacks or better. If you don't have a pair of Jacks or better, you have to check. If you do have better, you can "open" for a bet. You don't have to, but if it checks all the way through you'll have to throw your hand away. If everyone checks: everyone throws their hand away, everyone antes again, everyone gets new cards, and you start again. This happens until someone opens. You don't need jacks or better to call or raise after someone else has opened--just as the first person in the pot.
After the draw, if there is a showdown, the winner must have trips or better. If they have two pair or worse, there is no winner. The players that saw showdown all ante again. They get new hands, and it plays out again. If someone bets and no one calls, they can win without having trips or better.
These pots can get progressively larger. People will often stay in with poor hands, in the hopes that people betting after the draw won't have trips or better and they will get a new hand. If you fold, you are out until someone wins, so people don't like to fold in this game. They stay way longer than they should and call with hands that can never win. You'll be called by two pair and worse way more often than you should be. As a word of advice, don't be that person.
Example of a hand that's close to how things played out fairly often.
5 players ante. Pot $1.25. It checks through. Re-ante and new deal. Pot $2.50. Player opens to $2. Three people call. Pot is $10.50. A player bets $10 and two players call. Pot $40.50... No one has trips. The remaining 3 players ante. Pot $41.25, no one opens. The 3 players re-ante. Pot $42. Player opens to $25 and gets called twice. Pot $117. Draw. Player bets $80. One person calls. Pot $277. At this point, you might have a winner. You might not. It is hard to get trips or better, unless you started with trips or better. If you don't, then you have a $277.50 starting pot, heads up. A 25c ante game should have pots of like $18 or $20, but these games can grow much bigger. This might be a function of the game I was in. It was very loose and wild and full of really bad players.