I have an odd but effective stopping-on-a-dime routine. I don't know exactly what I do mechanically, but I think I can explain what happens.
Basically, I nail both brakes and unclip from the pedals all at the same time. I then somehow plant both feet firmly on mother earth while locking front wheel, so nothing moves. The sass end of the bike lifts up behind me and comes to a stop when it hits me in the back.
Like I said, I have no idea how I do this; it's all automatic. It works like a champ, but I am a little concerned that I might do damage to my back or knees with this technique.