A childhood belief about dangerous food

I once was eating lunch at school, and a friend offered me a "cracker". She asked me how it was, and I, not wanting to be rude, just nodded in agreement. Much to my surprise, she told me, after it had alrwady gone down, that I had just eaten cat food! I thought I would die or get some weird disease or turn into a cat *meow*! Anyway, i never considered that cats eat the stuff all their life and dont die!