You know, I get that his initial reaction is "HOLY FUCK, RUN AWAY!", because frankly mine probably would be too, but you'd think he'd have noticed the pair of clearly human legs poking out of the bottom a little sooner. I mean, he was looking straight at it for a good couple of seconds.

That said, that probably says more about instinctual human response to threats than it does about the guy's preceptiveness, so I'm probably being a bit unfair.

THIS prank on the other hand, would probably give me an actual heart attack.