Anyone can mash potatoes!
Dead animals have skid marks AROUND them
Government bonds mature over time and earn money
A toad he croaks if you even touch him!
The shoe has a sole
You can mash potatoes, but you can't pee soup. (sorry sorry. Really. I've loved this joke since I was... oh.. six...)
ME: *nodding and sniffing myself* Mashed potatoes with gravy.
You can't mash Frankenstein.