When I was in Kindergarten (the year was 1961), it was my turn for show-and-tell, and I brought my favorite toy from home.
It was a plastic mock-up of a military-grade infantry rifle.
When I brought it out, the teacher objected, saying that I had violated the rule against bringing guns to school.
I was flabbergasted.
Anybody could see that it wasn’t a REAL gun. Just a toy.
“Adults are so weird” was my thought then (and still now, too…).
Edited to add: The town where this occurred was Sunnyvale CA, in the middle of present-day Silicon Valley (in those days, it was more famous for its apricot and other fruit orchards).