The Cruelest Prank Ever (VIDEO)
A pilot faked passing out, mid-flight. This is probably be the worst thing you could do to another human being for the sake of comedy. Totally worth it.
Judging by the date of the YouTube video, this may be somewhat old. But as well know, messing with people and convincing them that they're about to plummet to their death never goes out of style. (via Buzzfeed)