Watch the Christmas classic Rudolph the Red Nosed Reindeer.

Every time his nose lights up, you have to take a drink.
If the nose is lit for a long time, you take a long drink. It really is self explanatory.

(The original TV-movie from 1964 is available from Amazon.com on DVD and VHS. The 1998 re-make with John Goodman is also available on DVD and VHS.)