Oh man, when someone does that you really got to be careful. Just in case they have a buddy that's sneaking up behind you. Sometimes a person will ask, "What do you like to while not working?" just to get your attention and then their friend will jump on your back, wrap their arms around your neck and try to "Choke" you. Now, i put that in quotations because its not actually a choke. Your see, if its a choke, then the airway is blocked. That, and only that, is what a choke is.