2: Oh don't feel like you need to explain. I never know what side it's on, even in my own car.
2: Yeah I'm always opening the door to check. It just doesn't seem important enough to remember.
3: Huh. I know where mine is - but what I did was to identify a logical reason for it to be on the side that it is. Now I just always know.
2: Ah, so you're able to derive the information rather than storing it in RAM.
3: Yeah, precisely.
(no I wasn't #2, even if he and I are similarly absent-minded...I was #3)