[RustyBrooks]

Some games are played with a kill qualifier. Whenever a player wins a pot that meats the qualifier (usually a pot of a given size or larger) he gets a kill button. If he wins a second pot that meets the qualifier, the stakes double (if it's a full kill game) or increase by 50% (if it's a half kill game).

Also, the player who won those two pots has to post an extra blind which is double the big blind, and gets to act last preflop.

If you have the kill button and you lose a hand, the kill button goes to someone else and the process starts again.

So a 4/8 full kill game, when the kill is on, moves to 8/16 and the guy with the kill button post a $8 blind.

There is some emergent behavior in these pots that you should take advantage of:
* loose players are often less willing to play as loose, because there is more money in the pot
* passive players are less likely to call you down because the bet sizes are out of their comfort zone
* people don't stop to think that there's a little extra money in the pot

If you can be the first person to raise then you get to make everyone call $16 right off the bat when they're used to calling $4 or $8. The same thing happens if there's a straddle on, if you are the first person in you can raise and make people call more $ than they're used to. There's much more in the pot than usual, so it becomes worth it to try to end the hand preflop or on the flop and steal the whole thing.