Unlearning curve ...
What simple thing did you learn at an embarrassingly late age?
1. Driving through Newmarket and my 13-year-old daughter said, looking at a sign, "Ohhh, I see, it's called ten pin bowling because there's 10 pins! I always thought it was called Teng Peng Bowling because it was invented in China or something".
2. I learned what marital status was when I was about 18. I always read it as martial status, as in martial arts. I took karate when I was younger so on my first few job applications I wrote "yellow belt" instead of single.
3. When I was young, if I had an upset stomach my Mum would tell me to go and sit on the toilet. So I would put the lid down and just sit on it.
4. When I was a kid, I just assumed "sitcom" stood for sit-down comedy, as in the opposite of stand-up comedy because, you know, people are sometimes sitting down on the shows.
5. I was 23 on a trip with my girlfriend. We were both getting ready for the day in the bathroom and I needed my hair gel, so I asked if she could hand me my toilet treat bag. She seemed confused, I again asked, "Can you please hand me my bag of toilet treats!?" She ran out of the bathroom laughing.
(Via Reddit and reader contributions)
