blog.wired.com — A bloggy brouhaha erupted Tuesday after R.E.M. posted a video called "The Big Still" that Laughing Squid called a "blatant rip-off" of Improv Everywhere's "Frozen Grand Central" stunt. The band quickly removed the clip from its site and apologized, but it begs the question: What exactly is a rip-off, and what exactly is inspiration?