When you're standin' in the shower
And you smell somethin sour,
Diarrhea

When you're slidin' into home
And your pants are full of foam,
Diarrhea

When you're sittin' in a class,
And that fart let out more than gas,
Diarrhea

If you feel something runny
And you don't think it's funny
Diarrhea

i have to admit i got all those off a website i found from google.

EDIT: these are funny - "You sound like a shit salesman with a mouthful of samples."

"Never kick a fresh turd on a hot day." - Harry S Truman