Well, when I was younger I would go buy little action figures and tie them up to a ribbon or string. I would then swing it around and around, then at the right time, I would let go and they would fly up in the air really high. One time, one fell down on the neighbor's car and dented it slightly.
One time, I put one black cat (a fire cracker) in a plastic easter egg, then lighted the fuse, and put a quite large plastic cup over the egg, the cup blew 20 feet in the air and the egg was in little pieces. LOL
Went to the top of the tallest building in Austin and dropped things like matchbox cars and even a stuffed animal off the roof.
When I was 13, I had a sling-shot and would shoot little rocks or marbles way up into the sky, but one time, I heard glass break behind our fence and it turned out I broke the winshield of the people behind us' car! LOL
I have also jumped off many cliffs into lake Travis.