When I was about 14 years old and in school in the UK, there was a playground fad going on around the guys referred to as 'bell tapping'. It basically involved punching someone in the dick when they're not expecting it. One day, I was caught off guard by a 6'2" guy named Jamal while we were all stood in a group talking. By some divine intervention, I was able to completely internalise the pain and act like nothing happened. People thought I had iron balls, and so I was never targeted again.