Who would think that a safety film would leave such a lasting effect on a person? While in grade school (circa late '70s) we were forced to watch a bus safety film titled AND THEN IT HAPPENED which was intended to scare the crap out of us and keep grade schoolers in the bus seats instead of running around screaming. This safety film is grainy and has poor audio, but it did the trick for me.
For years I wanted to watch it again and see if it even remotely held the same dread and fear it had when I was a kid. Thanks to the Internet I found it and watched it, and am happy to say that although it's lost some of its sparkle, it's still a treasure for me. Unruly kids, knives, pets, bus crashes and children being tossed about like rag dolls. Perfection! Needless to say I never brought a knife onto the bus after that, and I tried to make sure my bus driver didn't have a heart condition before I acted up.