So I've been writing about ways prior roommates have pissed me off, but this is one where I was 100% guilty and still feel kind of bad about it...
In college, I had a single during my junior year, but we had a locked hallway and I shared a bathroom with three other girls who I didn't really know. These girls were all orthodox Jewish and so on the sabbath, they weren't allowed to do things like turn lights on and off. So they asked that on Friday evening and Saturday morning, I leave the light in the bathroom on.
I never ever did it.
Not purposely. It's just this automatic thing where I always shut the lights off when leaving a bathroom. It was a really hard habit to break.
So I'd often pass by the bathroom on Friday night and see one of my hallmates using the bathroom with the light out. I'd feel so bad!