In news that should excite all fans of great comedy, the (actually) universally beloved Michael J. Fox will be guest-starring on an episode of "Curb Your Enthusiasm." Hell. Yes. Here's what Fox has to say about it:
"Larry moves to New York and takes the apartment below ours." The Curb subplot finds Larry believing that "I'm being symptomatic just to annoy him — a whole passive-aggressive thing. He's complaining because I'm shuffling and making noise upstairs. It's very funny."

Well, I'm pretty excited about this. And apparently Michael J. Fox's onscreen dad on "Family Ties" is making a guest appearance in a different episode as Larry's dermatologist. Listen, HBO - since the world might be ending on Saturday, why not just show these episodes now? (TV Guide)