A funny thing happened to my chum Harry when he took his motorcycle driving test for the first time. He'd gone through all the various sections of the test and was left with just the emergency stop to do.
Mr Luck, the examiner, asked him to drive round the block several times and said that he'd step out into the road at one point and Harry would have to stop sharply - the idea being that he'd need to keep the motorbike in a straight line and upright.
Well, off round the block went Harry. However, he was delayed for a while by a delivery lorry blocking the road. As he turned the final corner to drive down to where the driving examiner had been, he was surprised to see an ambulance and the examiner being carried away on a stretcher. Apparently the examiner had made an error. He'd stepped out in front of the wrong motorcycle and the rider, not expecting this, had knocked him down.