I have hand-caught 'copters before and find it is not always the best thing to do. Had a hexicopter go bananas on me on a take-off and, had I not reached up and grabbed it, I am sure it would have flown away uncontrolled. When I grabbed for it one of the props made a series of slices on the back of my hand and on some fingers - and, yes, there was blood (lots and lots of blood!) On that machine I had to hold both control sticks all the way back and all the way toward the center to kill the motors, which you cannot do if you have one hand holding the 'copter and the other trying to manipulate the RC sticks.
My advice to those who hand catch: Use one hand to catch the 'copter, kill the motors (throttle all the way back for 3 seconds or more), the SWITCH OFF THE RC CONTROLLER ONCE THE MOTORS HAVE STOPPED SPINNING.