9 Things You Definitely Didn't Know About David Letterman

In 1966, he was a newscaster for the student-run station at Ball University in Indiana but was fired for "his irreverent treatment of classical music." Classic Letterman.

One of his first jobs was a weatherman for an Indianapolis TV station. In true Letterman fashion, he joked in his appearances; watch this clip for some of his cracks that even made the camera guy laugh.

With over 150 separate appearances! And Reej must love Dave, considering what he puts him through, like in this vintage clip.

It was Oct. 29, 2012, and the audience was sent home because of Hurricane Sandy.

It was the year of "Oprah, Uma, Uma, Oprah," but critics were not having any of it. Despite being blasted almost universally, Letterman was actually asked back to host but never returned for the job.

In addition to producing his own show, Letterman's production company, Worldwide Pants, produced Everybody Loves Raymond, the film Strangers With Candy, and the Foo Fighters' HBO miniseries.

On Dec. 31, 1999.

And "Everlong" is his favorite song. They've played several times over the years, most notably after he returned from a hiatus to have heart surgery in 2000, and on his final broadcast.

This year makes 33 years; Johnny Carson is behind him with 31.