When I was around 17 most of my friends and I were hooning around on 250s, the 'largest' capacity bike you were permitted to ride over here without taking your driving test. There was a mixture of bikes, several Honda G5s, Yam RDs, and my own Suzuki Hustler. Then, horror upon horrors, the Guvment moved the goalposts and reduced the limit to 125. It was like being castrated to us lot, so we all bought up 125s to take our tests, so we could get back on the 'big' bikes as soon as possible.
The first 125 to come my way, and that I could afford, was an old CB. I think it's fair to say it was knackered, but with a bit (lot) of regular fettling I managed to get some miles on it while I waited for my test day to arrive. On the morning of the test, it broke, flatly refusing to start. Panicking, and with no desire to wait another six weeks to take my test, I hired a brand new Yamaha 125 trials thingy from the local bike shop to take the test that afternoon. What I didn't know was that the ignition key had to be set in the second position for the lights and indicators to work. So with the examiner watching me, I completely lost it doing the left turn/right turn procedures at the junction, had a near miss with a car who didn't have a clue where I was intending to go, and I failed the test epically
Riding back to the shop on the Yam, and feeling ever so slightly pissed off, a Red Setter ran out between two parked cars straight across my path. I was doing around 40, hit the dog side-on and over the handlebars I went. I can vividly remember the brief moment when, lying in the road wondering why my right leg wouldn't work and when the next passing vehicle would run over my head, I peered up to see said dog merrily trotting up the road. Thankfully nothing else hit me, an ambulance arrived (which I was later billed for - good old NHS), and I learned I had escaped with nothing more than two grazed kneecaps and a broken ankle. Oh, and they had to cut off my Levis, which were brand new and I had been wearing for the first time that day.
An enforced lay-off ensued, during which time I rebuilt the old CB125, eventually passing my test on it a few months later.