I'm not kidding. I mean, the first punch, you just get this kind of sharp pain that spreads through your loins; but after the sixth or seventh one things kind of start going numb in that pins-and-needles fashion.
But if you keep going--and this is the best part--if you keep going the pain starts getting worse again.
You really know you've given your sack a good working over when you begin uncontrollably peeing blood and hallucinating that Obama is a conservative.