Is there actually any tactic depicted in the video or is everybody laughing at this because somebody said there is?
The little kid is a barbarian in Inferno. the chickens are mobs in inferno. The kid is showing us what barbarians do when they're forced to kite in Inferno.
It's humorous. Do you require more of an explanation?
Really? This post again? Why has this been in like every thread on every forum for days now. It was only mildly amusing. Hell even the blizz MODS are using it. Old joke is thoroughly beaten to death and old.