Let see. I was probably 2 or 3. Dad parked the car to run the house for a minute, left me in a running car. A late 60s or real early 70 4 door boat. I don't remember, he called it the bomb. Just waiting for it to blow up I guess....
I managed to put it in reverse and down the driveway I went, across the street and took out the neighbors rock wall. Didn't hurt the car but dad had to pay for a wall rebuild.
Several years later.. riding the garage door as it went up was fun... till the door came falling down. I think i was too big for that ride.
I really wasn't that destructive to my own stuff. But it sure was fun making an ACME bomb

. Pulled apart a bunch of .22s carefully packed the powder in a testors paint jar. Drilled the cap and used fuse. Wrapped it with a roll or 2 of black electrical tape.
Went to a different hood and found a secluded spot and a nice rock wall. Made a nice home for the ACME ball and lit the fuse. Ran around the block and BIG BADDA BOOM

.
no more wall. We split so fast. Lol.
a few years later I found pool chemicals make great reactions.
Powdered hyperclorite in the bottom half of a plastic soda bottle. Melt a candle and make a wax seal. Then the top is filled with muratic acid. Tighten cap and be careful. When ready squeeze the bottle to break the wax and shake. You have like a minute as the mix pressurized and eventually blew the bottle and fumigation of a nice green mustard gas.
Tide laundry soap and gas made a beautiful flammable jelly.
M1000 powered marble shooters...
Had some solid rocket fuel but didn't really know what to use it for. It burned underwater.