This is one of the best and funniest tongue-twisters

 I ever read:

 If a bra is an upper topper titty flopper stopper,

 a jock strap is a  lower decker pecker checker

and a roll of toilet tissue is a super duper doody pooper scooper,

what do you a call a Japanese drummer boy whose

father has diarrhea?

(scroll down, please) 

 A slap happy Jappy with a crap happy pappy.