For me it was a new Suzuki GS250T (embarassing in itself) which I got when I was 17. I rode up the road to show my mates and came back down the road rather quickly (yes, I was showing off). I put the front brake on too heavily, slipped on some oil outside my house and went arse over tit. Think it was my oil I slipped on too, so all round I was pretty peed off. And the shiny new crash bars were in my garage waiting to be fitted.