Embarrassing but true story. I was 18, Grandad gave my brother a musket...then gave me an old 12ga.he had. I took it to the shop at home, sawed off the stock and barrel. I shot it once, that was enough.
One night I hear a car coming up our long country driveway...so I grab it, run outside.
Turned out to be a friend of mine...so I toss it in the seat, sit down. He tells me his clutch is slipping, so he drives up the road a bit and around a tractor sales place.
All at once two deputies appear! Place had had break ins...I explained friend was demonstrating clutch slipping when one spied the gun.
Off to jail I go...ATF guy shows up...gun was about 6" too short. I'm faced with two felony counts...40 years!
I call Dad at now 3am. Parents thought I was in bed. You can only imagine the ride home! Dad hires a lawyer, judge after I explained understood at 18 I didn't know laws about gun length.
That gun ended up they told me shreaded or in a museum in D.C. I'll never know.