Ha. I thought I was the only person that did this. If I see my wife turn a switch off, I will more than likely follow behind her and check it is "really" off.
I am the only one allowed to do the nightly house check for locks, appliances turned off, temp set, humidity set, animals fed... on a rare night that I fall asleep in the living room and wake up at 2am, even though my wife has already done all those things before she went to bed, I have to do them again.
And yes, I know I have OCD.