I hate seeing cockroaches crawling up the wall next to you. Been in 2 'restaurants' where this happened, but ate my meal and left

I also hate seeing curly hairs in my food (only happened once, but recently also occurred to a friend of mine. She ate her food anyway!)

I also hate it when people can't spell 'shiitake" correctly. One of the profanity filters at work objects to that and I end up dealing with confused people asking why their email was blocked.