I was randomly thinking this the other day when DD answered my phone for me and told the person I was in the shower.
We were left home alone for small periods of time growing up, and my parents taught us that if anyone knocked on the door, not to answer it and pretend we weren't home. If someone called, answer the phone so they don't think the house is empty and if they ask for an adult, even if we know them, tell the person that Mum/Dad is in the shower or pool etc and can't come to the phone but they will call back as soon as they get out. NEVER tell the person that we are home alone.
Then it struck me, I would never teach my kids that because they will never be home alone that young lol.
Other things were what to do if we were riding our bikes/walking alone and got approached by a stranger at the beach or park or street. (we were all aged 5-10 for example, and I don't know if I will allow my kids the same "street freedom" I had)
Anyone else have any examples of what they had to learn as kids but will probably never need to teach their own kids?