I was about 18 and found a tiny bicycle on my grandads farm, the seat reached my knee (I was about 5' 10") So I found the steepest lane on the farm, at the bottom of which the concrete evened out and then fell away steeply creating a dip I could ramp off. I went about 20 metres up the hill, flew down and got about a metre of air, then I tried from halfway up the hill, around 50 metres of slope, accelerated way to fast (the bike had no brakes) flew off the ramp, travelled about 5 metres through the air, and when I landed the bike collapsed from under me, and I slid another 5 metres or so, ripping my jeans to shreds. My mum watched the whole thing from the kitchen window and came out to tell me it was my own fault, then went back inside leaving me to bleed all over the yard, laughing away.