It is when the heavy metal dude is talking with silent jay and bob outside the quiki mart and they ask him to do a little berseker stuff ( and the lyrics that ensue kind of butcher the language too). I am going from memory of seeing it about 18 months ago so I probably just screwed the pooch with my description of the scene
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"Some say I'm lazy and others say that is just me.
Some say I'm crazy, I guess I'll always be"