Jello Down the Back?

“This is my son and my Dad, taken at a restaurant where we were celebrating my Dad’s birthday. I have absolutely no idea what happened here to cause my dad to make that face. Speculations have included jello down the back of the shirt, Julian standing on Dad’s foot, or possibly some sort of horrific wedgie incident. Anyway, it’s been a family favorite for years.”

(submitted by Molly)