Can I Get A Napkin Please?

I was just browsing the Publisher's Weekly daily newsletter when I came across a bit about a new book out called "Causing A Scene: Extraordinary Pranks in Ordinary Places", which prompted me to check out the Improv Everywhere blog. Basically this group organizes large scale improvised pranks in public places with some pretty hilarious results. Haven't had a chance to check out all the pranks which they detail on the blog, but my favorite so far is Food Court Musical.