Ok so I am rather ashamed to have done this for a third time....rode off for a good half metre and bang nearly drop the bike from the sudden stop. Left the disk lock on. :-s In a carpark with one person watching. Bike was about six inches from handle to ground though managed to keep it upright. Thumb and knee still very sore after two days rest. If you use one please remember to check EVERYTIME. Not really a near miss but it is in its own kinda way.