A.P.
When I was a kid, my sister told me if I ate them, my skin would turn green. You know, I swear there was a kid in first grade who ate his and his skin had a green hue! Anyway, how about a reward system for not eating them?
I did a quick word search on Amazon and came up with a book called Dude, That's Rude! Maybe someone else has read it and can give there opinion on it?