If you look just as Chester is picking up the guitar and smashing it on the metal thing, you can see Mike from his chest to feet on the right of the screen. At one point, just a Chester is picking up the guitar, Mike makes a hand signal as to say "What the hell are you doing?" Look for it because it's there. I went back and watched it about 40 times
[EDIT] For those of you who are confused, this is at the end of 'Place for My Head"