If it happened to me, I'd feel humiliated, for being singled out and laughed at. Humiliating anyone, even for a "good" laugh, strikes me as cruel. I hate being the butt of practical jokes inflicted on me for the sake of others. I guess I could see, though, that if this guy or anyone else came out of it feeling glad that it happened to them, that would be okay.
Still though, where exactly IS the humor in this, if not in seeing another temporarily humiliated?