In chapter 8 of the DVD right after they show Pig Benis talking to the camera man about metallica and early def leopard ripping off some band, it goes to a live feed from their concert showing Benis playing Bass; Does anyone know the song they are playing at that part?

Any help would be great

Thanks in advance
, Pig Benis..
Uncle Vernon, Uncle Vernon,
independent as a hog on ice,
He's a big shot down there at the slaughterhouse,
Plays accordion for Mr. Weiss