Another variation of "Quarters" is called Catch-Up Coin. (Well, that's what we call it in Australia, I suppose those elsewhere could call it Catch-Up Quarters. Here, Quarters is called Coin, and we play with a ten cent piece.)
Catch-Up Coin follows the same basic principle of Coin, but with two glasses and two coins instead of one of each. The glasses start at opposite sides of the table, and the two players with the glasses try to bounce the coin into their own glasses. They keep trying until the coin is in the glass. Then, the coin and glass is passed on to the next person. Both glasses move around the table in the same direction. The object of the game is to "catch-up" with the other glass. If you have control of a glass when the other glass catches up to you, you must drink the contents of your glass.
The glasses are then put to opposite sides of the table and the game restarts.
Note: It is advisable for everyone to have their own drinks, and the two rotating glasses to be empty. It makes things a lot less messy and a lot more hygenic.
This is a good game to play after you've been playing conventional Coin for a while. Once everyone has a bit of alcohol in 'em, the excitement of two glasses chasing each other around the table is quite intense.