Anyone can mash potatoes!
A tire
The phrase I went through a whole box of tissues watching that film. usually has a completely different meaning.
Amazon prime.
A white cross emblazoned on a white background!
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.
Mashed potatoes.
You can't mash Frankenstein.
Guacamole.