By the time I was 13 my dad kinda regretted teaching me how to build things
Found the cut off piece of 12g barrel from his sawed off. With a pipe tap and plug i had a cannon that i strapped to a wooden toy crossbow. Lit the fuse, it went boom. Heard a scream, looked around the corner to see the mailman falling down 12 stairs.
Grabbed some pipe fired up the welder to make a mortar that shot empty 20g hulls with aa batteries inside.
Pushed 22lr into the ground, stood back and shot the rim with a pellet gun.
My dad told me about putting a potato in tailpipe's. You wouldn't believe the concussion from a muffler blowing from five spuds in the tube.
Grandpa taught me two coke bottles filled with "stuff" one 6 inch fuse one 12 inch fuse. Light at the same time 12 inch fuse right in front of you, 6 inch as far as you could throw it. The 6 inch would scare the fish towards you then the 12 would go off. Grab a net. Thank god my grandpa was drinkin buddies with the fish and game officer.
I better quit talking before I incriminate myself