My latest issue of Guitar Player turned me on to this guy, who takes videos of famous people wailing away on guitar, and overdubs crappy playing that kinda matches the finger movements. It's available in Santana, Vai, Iron Maiden and other flavors - all of which make me giggle like a wee girl.
No one who isn't a musician has laughed as hard as me when I showed them, so I might as well take a poll:
(a) Are you a musician?
(b) Is this really, really funny?