What is your pet peeve?

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Two of my pet peeves are: 1) Flipflops - the reason why I have a problem with them is because of the sound it produces. And since I live in a hot state, almost everyone wears them, and it drives me insane. 2) People who complain too much: I dont mind it when people complain because they are constantly being abused at work or anything of that sort, but when they complain about thing that they do to themselves because of they stupidity or because they are too lazy to do anything, I get annoyed. What is your pet peeve? Are yours as strange as mine?