We know that Hollywood and others are capable of creating video images that look real but aren't real. Still, we generally tend to accept video evidence of an occurrence as proof that it happened that way.
But after watching this, I think it's safe to say we should no longer accept video as proof of reality:
Anything, any scene can be invented from scratch and made to look real. (Thanks for the reminder, TechCrunch.) The implications for criminal justice proceedings, conspiracy theorists and Internet cat videos are huge. But for now, I'm just going to go watch that a few more times.