Ridiculous. You just have no sense of humour, some people for a prank, just like to knock pranksters out. I would argue that approaching people in an attempt to humiliate them shows a lack of self control, self respect and self awareness. The youtube prankster is the one who has no thought at all of repercussions, consequences and risk vs reward.
I could have warned that idiot for free that someone would eventually knock his arse out. Obviously people who think the way that prankster does have been raised terribly, no respect for anybody, no social conscience etc etc. just another example of generation nothingness.
I have a big sense of humour, which is why i wouldn't punch someone silly for doing a simple prank.
If the prankster made it apparent that he would try to prank me in a humiliating fashion, i would let him know what's what with words, and only retort to physical form if the prankster would try to do something physical.
But a mere prank done with words should never be retaliated with the destruction of his joints, that is something i save for something more important, ie someone trying to attack me (self-defence) or similar.