I don't remember smiley face fries or potato smiles being a thing when I was a kid, but I know some people my age (thirties) who are nostalgic for them, and I know some people in their mid-twenties who had them in school as a kid. This page purports to answer the question but doesn't as far as I can tell. So who invented smiley face fries or potato smiles, and when and where did they first come out?