Many people are not aware of coat snatching. If you wear a valuable coat in public, you are vulnerable. A thief will come up behind you and smash a raw egg on top of your head. As you instinctively raise your arms to feel what happened to your head, the thief will grab the bottom of the coat and suddenly pull it up and over your head. When do quickly and unexpectedly, this may be done rather easily. When you look around, all you see is the back of the person running away.
Taekwondo training will help you not to act instinctively. Instead of reaching up, you should suddenly move forward at an angle while turning into a defensive position. This may be done quickly and smoothly so it is effective while not appearing too strange if you were reactive to an innocent action.