Overheard being sung/screamed by a large man walking quickly past me today on the street( to the tune of "What do we do with a Drunken Sailor," sort of) :

"Ooooooooh, What do you do when you see a little rat?
KILL IT! YOU FUCKIN KILL IT!
Aaaaaaand what do you do when you see an old nun?
KILL HER! FUCKIN KILL THAT BITCH!"

-Repeated twice. Then, (switching to the tune of "We Want the Funk,") a finale:

"I LIIIIIIIKE THE ROCK!
I LIKE TO SMOKE THAT ROCK!!!!"