Here's a clip from the not so well known and very mediocre (I remember seeing the boom mic come into the shot on several occasions) film Bongwater from 1997. Even though Jack Black is featured prominently on the main cover art for the flick, he appears in it for less than ten minutes. But goddammit do I love when he's in it. This is also one my favorite Tenacious D songs.
PS- Believe me, the song makes more sense in the context of the Tenacious D HBO episode.