Ooops...that ain't food!!
The other day I was browsing at the $1 store and I saw these small plastc cups labeled "tarts". They smelled so good. I picked up a birthday cake one. Smelled just like it. Looked like candy. I bought it. I took a bite of it. Yeah-it was definitely not food. I googled "tarts" to try to find out what it was, turns out they are some kind of wax fragrance things. I feel duped. There was no indication that this thing was not edible. Everything pointed to it being food.
So what's your "ooops, that ain't food" story?