I remember doing a version of the shark song which says...

"Baby shark...(all the way till you lose every limb)..."
after you lost each limb...

"Six Feet Under. Doo doo Doo doo
Six Feet Under. Doo doo Doo doo"
(while doing this you bounce happily like you are a corpse in a casket).

"Worms and Magots. Doo doo Doo doo
Worms and Magots. Doo doo Doo doo"
(while singing this you do jazz hands up and down your face to mimic worms and magots on your face--Graphic Egh ).