Pranks are so funny, but are they okay?

One of my favorite internet websites is youtube.com and on Youtube, exists a page called CollegeHumor. The object of their page is simple, show as many pranks, insults, funny videos, and just plain god awful jokes as possible.
I was visiting the site yesterday, and I came across the video The Half Court Shot

This is one of the funniest videos I have seen In a while, most likely because I am so glad it did not happen to me. The superiority of being "in" on the prank made everyone in the crowd extremely happy and excited when the opportunity came to be involved in the joke.

I think the main reason why this joke was so acceptably funny is the fact that Amir and his friend have an ongoing "Prank-War". Since we know Amir has done terrible things to trick his friend, we have little sympathy for the emotions he might be feeling.

The real question is whether or not this would be funny if it had happened to an ordinary fan. In the case of an ordinary person, the crowd might be a little hesitant to play such an emotion wrenching joke on them, I know I would.

The fact of the matter is, Pranks seem to only be acceptable when they are "deserved" in some form or way. When an innocent person gets a prank played on them, the joker is toying with them in an unconditional way that is very morally questionable.