Well my first solo flight was in a hang glider (early Rogallo wing type).
The milkman had bought one - I was an aeromodeller and he thought I knew about flying - so off we went, climbed a hill and threw ourselves off.
I landed safely (luckily), but the milkman hadn't appreciated the term 'positive angle of attack' and slid down the hillside and ended up in a tangled mass of rigging wires cutting himself badly.
My father had said 'under no circumstances ...', but as a 17 year old what is one to do ... ?
That was my first and last hand glider flight.