Roommate thinks he can play guitar pretty well... But in real life, he strums slowly along to the tune of the lyrics. It's the most awkward and unpleasant music I've heard outside of a circus.
Somewhere along the lines of Phoebe from Friends singing "Smelly Cat" Except that I live it, all the time, so there is no humor to be found. He also decides he likes a song and then plays the chorus over and over for days, if not longer.
If only you could hear the horror coming from my living room. Blegh.