doopdadoo
The name given to the cardboard cylindrical tube which resides within the toilet paper or paper towel roll, so named because of the sound that people make when they remove the empty cylinder and put it up to their mouths.
Much like the prize in a box of cracker jacks, I love to be the lucky person who uses the last piece of toilet paper so that I can emerge from the bathroom as a musician, demonstrating my skills on the doopdadoo.