Last year I taught in a middle school where there was a running club (they also had a track team, but this was in the "off season") with about 50 kids. Their coach told the students that a mountain goat could run faster than a cheetah and I was asked the very next day (and several more days after that) if this were true. The coach had to go on the morning announcements a week later to tell the students it was a joke and that a mountain goat couldn't run faster than a cheetah. Some of the kids think she was pressured into telling them that.
A childhood belief about teachers

others believed things like this
- i used to think that the faster you go in your car, the faster the car radio went.— Matt
- When we were little my sister thought if you mixed cow’s milk and water you’d get goat’s milkAnon
- I used to think that the chorus of "mountain song" by jane's addiction was in a different language— nothing'sshocking
- I was convinced that hot air sinks. Why else are mountain tops cold, and Death Vally is so hot?— Not-my-wife
- We used to think that if you ran swinging your arms around, you would run faster. — Christine
- Red shoes make you run faster. — Ann B.