I never realized it was weird

There are things that I do, little unconscious habits that I never think about, things that I've always done, things that I learned, for the most part, from my mother, growing up. And the funny thing about marrying someone is that they do things differently from you and sometimes they notice when you do weird little things that you yourself never notice. And sometimes they ask you WHY you do a particular thing and when you try to explain you realize that you sound insane, or that "Because that's how it's DONE" isn't really a sufficient justification.

But sometimes that IS how it's done. And even though it's weird that doesn't mean it's WRONG.

Some examples:

1. When I park in a lot that requires a ticket upon entry, I always take it with me out of the car. I scolded Torsten a couple weeks ago for leaving the ticket in the car. When he asked me why that was bad, it took me a minute before I remembered the explanation my mom always gave me: because if someone steals the car, the parking attendant is more likely to remember them if they didn't have a ticket. Likely? No. Possible? Theoretically.

2. When I use a public restroom, I always hang my purse on the lower of the two hooks. This is because if someone comes by and reaches over the stall to try to steal the purse, they will try the top hook first and I will have time to see what is happening and grab my purse before it can be stolen. Again, likely? No. Do I do it every time I use a public bathroom? Yes.

3. I always lock my car doors when driving, just in case someone tries to get in the car and hijack it when I'm stopped at a red light. Torsten actively disagrees with this. He was taught in driver's ed in Germany not to lock the car door because if you get in an accident the lock mechanism could break and you might not be able to get out of the car. His scenario seems more likely than mine but I still have trouble with the idea of not locking the car doors.

Of course, my mom also taught me a lot of stuff that is more basic/universal, like, you know, look both ways before you cross the street, never show up to somebody's house empty-handed, always send a thank-you note when you receive a gift, always wipe the public toilet seat before you sit down. But nobody ever questions those. But that doesn't mean that these other, less common habits are any less ingrained in my routine, you know?

What about you? What weird things did you grow up doing without thinking about until somebody pointed out to you exactly how weird they were?