Lung puppets
My friend Crystal did a very similar thing with a slit cow's heart, and actually succeeded in making three of her classmates sick. Mostly because the undrained blood would spurt out every time "Mr. Weebles," as he was called, would complete a syllable.
written by excluded pupil, approved by Susan

Rather poetically, I made a glove puppet out of a heart. I did this by slicing through the base and sliding my fingers into the four arteries. Behold, my meaty chum could quip, cavort and mischievously squirt blood into Matthew Corbett's eye. Cheeky old "Harty"!
written by pe*ro s*nch*z, approved by Rosy