1) Way back when I had a kid stop me while I was riding my bike. The both of us must have been 10 years old. I was very naive at the time. Kid asks me to help him 'get into his house' as he lost his key. Wanted me to climb up to second story and break into a window. Even being naive at the time, I saw thru it and started pedaling. MY first encounter with a bike thief.
Never forgot the experience.
2) My dad told me not to ride my bike out of the neighborhood. So what did I do? You guessed it. My dad came home one night and saw me out of the neighborhood. He stopped, put my bike in the back of the station wagon and told me to tell him when we got home why he didn't want me to do that. When we got home I told him it was dangerous and that someone might try to "get me", or I could get hit by a car and things like that. He was fine with that answer and never approached the subject with me again. Didn't take the bike away from me or anything. Now, my siblings had a habit of being confrontational with this kind of thing and were always in trouble. They thought my Dad was real mean. I recently confronted my siblings with this story and others and I really think I made headway with them. But they are really, really hard-headed.