I was shunted from behind many years ago (1973). I couldn't get far enough out of the way, there was a Melbourne tram right in front of me. It wasn't much fun! I've always been cautious in those situations. It it could easily have been much worse than it was. The bloke who hit me was accelerating at the time, so there was no screeching of tyres. He went on to hit the tram, but I fortunately was pushed out of the "firing line".