No offense, Justin Theroux. But this is the most exciting Parks and Recreation casting news of the day:

Amy Poehler's real-life, hilarious husband - Will Arnett - will guest star on a January episode of the sitcom.

Arnett has a recurring role as Jack's nemesis on 30 Rock, but he's best known as Gob from Arrested Development, one of the funniest characters in the history of TV.

According to NBC, via E! News, Arnett will portray a "MRI tech" in Pawnee. That's all we know about the role for now. Except for this:

It's sure to be hilarious.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.