Sketchbook - keys

My wife never puts the keys in the same place when she gets home. I'm not sure if this is a personality difference between us or just a male/female thing, but I tend to do the opposite - the keys go on the key hook near the door, the wallet goes on the same shelf when it's not in the same back pocket of my pants. If I don't know where my wallet is at any given time it grates on my nerves [although the only important thing in there is my license]. The wife on the other hand is never quite sure where she left her purse.