I knew this guy once who had a lot of things he had to check before he left the appartment.
First he started in the kitchen checking the owen, microwave, coffee machine and watertap being properly shut down. All lights turned off.
Then he moved on to the bathroom, checking the water tap, the toilet, the tumbledryer and washing machine and unplugging the chords from the wall.
The livingroom was the most important one; pull the TV, Video and Satelitte chords out, turn all all lights and pull two or three chords out of lamps and radio as he moved on.
When he had done all this he did a cross check - moving through all the rooms in his appartment checking that not any lights were turned on or he'd miss anything. What's funny is that he could stare at a lightbulp and ask me if it was turned off or on for the final check out.
Then, if we drove his car or something he could turn around and drive home to check the kettle or coffee machine; he could not remember if it was switched on or off.
Speaking in general if we were going to the cinema we had to start leaving 1 1/2 half hour before the show so he could use the time he needed without stressing, did he stress he would certainly leave the cinema to check at home.
I often told him that "hey mate, everything is alright at your appartment. I did cross check for you when you didn't notice" and he sort of let the tension loose but you could watch in his face that he put a lot of efford into thinking about everything being alright or not.
He did experience a lot of house fires being young which marked him really bad. I don't know where he is now, I've been told he's dead by now, others say he's still alive.