Where to start?
Well, when I was 10 or so my friends and I thought it was great fun to ride our bikes across ungated railroad tracks as a train bore down on us, blastng his air horn over and over as we 'cut it' as close as we dared before the train passed the crossing.
We probably aged a few train conductors quite a bit with that stupid stunt, but hey, we were just kids and never understood the real danger we were putting ourselves into.
Honest, Mom, we didn't! 