This isn't evolution. Some $hit in his food.
That is not what I meant. The brain thing is disgusting. The parasite thing is too if you stop to think about it. Just like dust mites in your bed. If I think about those things crawling about it makes me itch. So how many times have you been tested for tape worm? I never have. Makes me crawl thinking about it. There is more than this to eating out--the thought that someone might spit in my food is enough to keep me home.