Weird things happen when a hypnotist shows up. Everything suddenly becomes a lot more funny than it really is, because you know people are suddenly acting silly when some guy in a bad vest snaps his fingers.
Also, booze is sometimes involved, and sometimes people flap their arms like they're chickens while clucking loudly.
While that may not have been the case with the USC and Georgia Tech football teams when it became part of the show during festivities a couple of days before the Sun Bowl, one can only assume this was more hilarious in person.
Of course, what really matters is that this event was held to entertain the troops at Fort Bliss. If they managed to succeed at that, that's what really counts.