The most remembered lesson from elementary school may very well be "Don't run with scissors!"

well my kindergarten teacher helped teach me how to read, that one was pretty significant

Not in the curriculum, though a sister of a classmate actually fell while running with scissors. Permanently blind in one eye, and a lozenge as pupil. Indeed not something you forget easily.

Stop, drop and roll.

I’m glad no-one ever said anything about kitchen knives.

Tell that to Running with scissors