In addition to great camouflage, being a successful sniper means putting in time at the range to accurately “zero” or aim your weapon’s scope. To be a successful sniper prankster, apparently all you need to do is just twist the knob on another guy’s scope and ruin all his hard work.

The funniest part of this video is the look that the sniper gives the man who is at least a foot shorter than he is. Apparently, messing with the zero on a sniper’s rifle is a big no-no.