That's right, I said "catsup".
When I was a wee small squirt, my older brother and sister convinced me that catsup was pronounced "cat soup" and it was so called because the red coloring came from the guts and blood of cats. I believed them for years.
I also believed my brother when he said that when a mosquito bite itched, I should scratch it til it bled because then the stuff that made it itch would ooze out with the blood.
Good lord I was the dumbest, most gullible kid on the planet, I'm pretty sure. /blush
Edit: Oh, and that mustard was "mouse turds." Ahh, siblings.