Originally Posted by
Chac
It's because the impact and sudden lapse of pressure throws off the vestibular system in the inner ear, which causes a person to faint, get thrown off balance, and also puke, yeah.
Ask my bro, I actually busted his eardrum by cup-clapping him over one ear. :{
Twas an accident. If you ever get in a fight, go for the ears or side of the neck.
A chop in the neck is incapacitating. You can also kill their arm mobility if you get it right above the shoulder. They won't be able to fight properly.