"Hate" can be such an open-ended word in a community chock full of sadists and masochists...lol
I enjoy a pretty decent amount of pain, m'self, so clover clamps with a little chain connecting the two work quite nicely to accomplish that, especially when taken off.
However, if you simply want to annoy me I hate anything with little pokey or pointy ends. Dunno why, they don't really hurt per se they just don't do anything for me. Yup, hate those.