I wouldn't have caught him either. I don't allow anyone other than my wife and my doctor to touch me. I don't touch anyone else either. Anyone that tries to cross that line ends up having a bad day.
You know that when he thought of doing this, he had to accept that he won't get caught by everyone. =P I gotta applaud him for that. I wouldn't be able to fall backwards unless I knew 100% I'd be caught by the person.