Only one comes to mind for me at the moment - whenever I take my foot off the clutch of my car when I'm driving, I ALWAYS check (sometimes up to 3 times), that my car is in neutral and not in gear so I don't jerk forwards, backwards or stall. I'm very pedantic about it! It arose from when I drive and I'm tired, I lose concentration and forget I'm in gear.

I don't worry too much about house security although we always lock up at night and when we go out. I'm in a really safe, quiet area. I have been burgled before though, and that's always in the back of my mind.