Ah, but the difference is (unless you're just lying to yourself

) you are actually double-checking to make sure. I do it because if I don't click every menu before exiting, it bothers me later. Picture in your mind Jack Nicholson in "As Good As It Gets", dial it back a bit, and you've got me.
When I watch TV or listen to music, the volume must be set at a volume that is divisible by 5. When I walk, I must take steps evenly; if my first step is on my right foot (and it always is) then my last step will always be on my left. If I'm browsing the internet and I have several tabs open, when I'm done I have to close each one individually, never closing them all at once by closing the whole window.
You see? Craaaaaazzzzzy.