At some casinos you can get \"overs buttons\" which are little disks that say \"overs\" on them and anyone at the table that wants to play can take one. What it means is in any pot where the only players still with cards all have overs buttons, the stakes raise to some pre-defined amount, usually double the limit.
Preflop they have no effect so even if every player has an overs button the preflop limit is the normal one and then postflop it would change to the overs limit (makes for an interesting and different structure, for instance 20/40 where everyone has overs would become 20 preflop, 40 on flop, 80 on turn/river, 20/40/80 which has huge strategic adjustments).
I one time saw a game where the overs \"limit\" was actually no limit, so it was like a 8/16 limit game until only overs people were in a pot and then it was NL.
-DeathDonkey
