I'm an American, and for a good long while I thought that Boxing Day involved the sport of boxing.
A childhood belief about sport

others believed things like this
- I thought that Boxing Day had something to do with boxing, like watching a global boxing competition.Anon
- I used to believe that the rock thing they used in the sport Curling, was a tea kettle.— Kaninchen
- Some sport cars have a double exhaust. I wondered why. Why would people want to pollute twice as much?— F*ck the environment?
- I thought that smoking pot involved an actual pot from the kitchen.— Aeris
- I thought sadism involved being sad and depressed. Obvious, I think.— ]_]
- I thought break dancing involved actually breaking stuff!— Sydle