Potato salad.
I took the very first bite of it at age three and immediately puked.
The babysitter was furious. "That's NOT good TABLE manners!". She whipped me with an extension cord until I ate the whole serving bowl.
Much later, my Dad saw the marks on my back. He asked whether the cat had made them. I just pointed at my back with my thumb and said, "Shirley done it."
He fired her, but didn't press charges.
Literally, the smell of potato salad still makes me relive those minutes.