Very simple. With the following rules, more or less whenever Rainman speaks, you drink.

The Game:

* Get the movie Rainman.
* Buy beer.
* Whenever Raymond has an outburst drink for as long as his outburst lasts.
* Whenever Raymond says "Vern", "Walbrook", or "definitely", drink once.
* Add any other words you wish to the above list.
* The winner is the participant who watches the entire movie.