"One step closer and you'll get the whole picture!"

[scarfman]

It keeps popping up on my flist that Harry Potter's Daniel Radcliffe is appearing onstage in Equus, nude scenes and all. But one of the articles linked to stated the play was written by Paul Shaffer. The play was written by Peter Shaffer. Paul Shaffer is David Letterman's sidekick. There must be a great joke in this, but I can't come up with it because I don't watch David Letterman. In fact, I started not watching David Letterman before he was popular.

Bonus points to whoever can reconstruct the chain of association that led to the title of this post.