A mate & I started a small fire in his back yard one cold wintery day. We thought we we so smart. In no time at all the side of the shed is in flames. We managed to put it out, suprisingly, but got one hell of a scare and covered in ash.
Same mate again & I played around with chlorine, fire & god knows what else in a confined space. Near on asphyxiated ourselves. Years later found out we could just as easily have blown ourselves up with just the right (or wrong) mixture of the crap we were playing with.
Again, us two bandits swam out to dinghys and small boats and unhooked them from their moorings.
I'd skin my son alive for doing any of the above.