I've heard about fifty different explanations of the video's "fakeness", all of them from self-styled experts, including:
. The video and/or audio "visibly skips" at the point of impact
. The sound of impact does not match what a bowling ball landing on a toddler's head would sound like
. The bowling ball would not have bounced that way (which is bullcrap; bowling balls do bounce, and often pretty high depending on how high it was dropped from)
. There was no blood/the amount of blood was wrong
. The kid's head didn't explode into hundreds of gibs
. The announcer did not yell BOOM HEADSHOT
. The kid is "obviously a doll"
. The kid is "obviously a midget"
. The girl at the beginning is a terrible CGI effect (this has been proven; her hair is visibly pixelated)
Even if the bowling balls were rubber and the kid was a midget, it's still a frighteningly realistic, totally unfunny attempt at edgy humor.