Originally named the "Love Boat Drinking Game." Very fun, with a high buzz factor. Supplies: people, beer, and a tv show with enough different characters for each player.
Before the show starts, each player chooses what character s/he will play. For example, if watching the "Love Boat," someone will play the Captain Stuebing, one will play Gopher, another the Doctor, another Isaac, and even someone will be the Pacific Princess.
During the show, when ever the character appears _on screen_, the player must drink for the duration of the appearance. If the character is simply referred to without being present, one drink must be taken.
Many shows are very well designed for this game. For example, "Cheers" has many characters on screen for long durations. This means that a lot of beer is necessary.