Mind Games
I have this odd habit of "collecting" colors in a room, scene, etc., in my mind; I pick out all the shades of red, orange, blue, etc., and then decide which shades I like best. Then I'll do it all over again. For example, if I'm sitting there at work, I think, "Okay, the cup is red, the guy's shirt is red, the pencil is red...."
I think I'm OCD or something...