Pet Peeves - what MINOR things drive you NUTS?

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Are there minor things that people do that drive you nuts? I'm talking about things that are so minor that they don't even really matter, but still it drives you nuts everytime someone does it. Here's an example. At work we have our bathrooms in a hallway. There is a tiny entrance way leading to the bathroom door, then the bathroom itself. There are always lights on in the hallway and in the bathroom. Here's the pet peeve. There is a little dim light in the entrance way. We try to keep these lights off to save electricity and be more green. Almost everytime I go to the bathroom, that little dim entrance way light is on ?!?! People turn it on, as if they can't find their way to the bathroom door without it, and then never shut it off. It drives me nuts! Ok so shutting that is probably only saving a penny of electricity because it's so dim. But it's the principle of the thing! First - I always wonder who turned it on (as if they couldn't clearly see the bathroom door right there), and wonder why they never turn it off. What about you? What minor pet peeves do you have?