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