I hate eating fish. Not only because it tastes horrible, but because I know that what I would be eating is what swims round you in the sea, or what's in your tank. It would be like picking a fish up in the sea and eating it, which, needless to say, would be disgusting.
I don't really eat eggs, and I very rarely have milk or butter (I hate the taste of it). I've gone off meat - I refuse to eat any meat at all, including chicken. My parents keep putting it on my plate, and I keep leaving it. They'll get the message one of these days, even though I've already told them I've gone veggie.