I've done a few, here's the worst:
Back when I was living in Victoria, I was about 15, me and 2 of my mates decided we'd go for a little trip in one of there cars.
We were driving, and eventually we thought might aswell go home now - It was like a night drive kinda thing.
Anyway, we stopped to get some petrol and something to eat, and I popped onto the bonnet, thinking I'd just lay there while my mates ran in.
Anyway, somehow, my mates got in the car without me realising, but I didn't get off the bonnet for some reason.
They started to drive - Laughing - But I thought it'd be cool to stay on, so I stayed there.
Then they started to speed up a bit when they got to the road, and this scared he **** out of me.
So I stood up, and JUMPED off the car, straight onto the road.
It hurt. :(