Videos: David Letterman

When 35 year old stand-up comedian Steve Mazan learned he had cancer, and might only have five years to live, he dedicated his life living his dream: performing comedy on The Late Show with David Letterman.

'Top Ten Signs You're Watching a Bad Science Fiction Movie' from May 17, 2013.

Comedian Trevor Noah performs stand-up on the "Late Show with David Letterman" on May 17, 2013.

Highlights from Dave's monologue for May 17, 2013.

"Top Ten Signs You're Watching a Bad Science Fiction Movie" from May 17, 2013.

With "Star Trek Into Darkness" now in theaters, don't miss this exciting tribute to the greatest villains of "Star Trek."

New non-smoker Will Arnett ("Arrested Development") shows off his best poses for smoking.

Dave gets a phone call from New Jersey Governor Chris Christie.

Ed Helms stopped by the € Late Show, € and told David Letterman that he just kind of realized that his € career-defining € biggest projects, € The Office € and € The Hangover € trilogy, are ending about a week apart. € It € s crazy, € he said. € I € ve been so busy promoting the movie and talking about € The Office. € I feel like I € m in this state of denial. And in about two weeks I € ll go home and curl up with my mother and sob uncontrollably. €

"Top Ten Things Overheard at the Retirement Home Brothel" from May 16, 2013.

Highlights from Dave's monologue for May 16, 2013.

Highlights from Dave's monologue for May 15, 2013.

"Top Ten Questions to Ask Yourself Before Spending $2 Million On A Painting of A Naked Bea Arthur" from May 15, 2013.

"Now You See Me" star Jesse Eisenberg performs a magic card trick with Dave.

Did broadcasting legend Barbara Walters do more than just interview Cuba's Fidel Castro?