Grunge rockers Nirvana show their distaste for following the rules in this hilarious recording from British music show 'Top of the Pops.' Apparently the show runners would force bands to perform live vocals over pre-recorded back tracks. The Seattle band predictably deemed this to be un-rock and roll, and, instead of backing out, trolled the entire performance of "Smells Like Teen Spirit" in their own goofy and irreverent way.