We had to doublecheck to make sure this video wasn't from The Onion -- some kind of elaborate spoof -- before posting it here.

We know that a good sci-fi movie transports you to different worlds and times and the best ones make you feel -- if only for a few hours -- that you're a part of a new and otherworldly environment.

But what happens when the film is over? According to this report from CNN, some viewers are actually feeling bouts of depression after watching 'Avatar' and being immersed in its alternative world of Pandora.

Watch the clip after the jump.
categories Movies, Video