For me, it has to be when people move things, and then don't move them back to their original place. I find it incredibly annoying, and forces me to go out of my way to properly place the things back, I also get mad.
[spoiler][b][i][u]KUPO!!![/u][/i][/b][/spoiler]
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Why must you know this? What is your practical motive? What do you need from us? Are we an innocent species? Are you an alien coming to destroy us? What alien technology do you have? Are you peaceful? What is the sine of 36? [spoiler][b][u][i]CONSPIRACYYYYYY!!!![/i][/u][/b][/spoiler]