Even volumes, numbers
Ever since I can remember, whenever changing the volume on my TV, Stereo, anything... I can't stand having the number uneven. I'll go completely out of my way to change the volume to an even number, but try not to make it noticeable.
Likewise, if I often go up two volumes, I'll go down two volumes before going back up again, to even things out.
Is this some form of Obsessive-compulsive disorder? Or am I just crazy.. :P