Worst experience with children?

Today, I was at my job and I was on bathroom duty when I heard this loud cry (and kids don't usually cry here) and I ran to found this kid on the floor, sobbing. I panicked so hard because these kids have serious medical problems and when I asked him what was wrong, he cried "I fell", which is bad, but still, I almost lost my soul at that moment. Anyways, what are your guys' worst experience with kids??? ╮(￣▽￣)╭