A childhood belief about chewing gum

When I was in kindergarten, I brought some chewing gum in one day and proceeded to chew it (not knowing the rule). The teacher noticed me and told me to go put it on the trashcan over by the sink.

When I went over there, the teacher's assistant was cleaning some small surgical scissors, tweezers and a knife. I got scared and cried because I thought she'd cut little chunks of gum out of my mouth and slice bits of my tongue off.

As it turned out, she used the tools to demonstrate something later on in class, but I steered clear of gum in school all year, just to be safe.