The following is a list of sketches performed on Late Night with Conan O'Brien on NBC.

Late Night sketches appearing on Tonight

Moral Outrage

In response to a recent news story, usually about misconduct, Conan speaks at length about his moral outrage, and his feeling of responsibility to remove this type of behavior from society; meanwhile, the camera occasionally makes brief cuts from Conan to Max. Conan may also speak of a dim-witted accomplice who aids the deviant in his exploits, after which the camera briefly cuts from Conan to LaBamba. Finally, Conan urges the public to expose such people using the show's address which, together with the heading "Shameless Adulterous Weasel" or the like, is superimposed over Max.

List of Late Night with Conan O'Brien sketches

In the Year 2000/3000

The sketch is typically performed with Richter participating, but after Richter left Late Night, the celebrity guest would participate (when Richter was scheduled as a guest, he would again take part). Each guest version would usually be titled "The [guest's surname] Edition" with "2.0" added for guests who have done the sketch more than once. In 2006, the naming format was changed to simply "The [guest's name] Edition". Its introduction is as follows:

List of Late Night with Conan O'Brien sketches

Conan: "... It's time, once again, to look into the future."Andy/Guest: "The future, Conan?"Conan: "That's right, Andy/[Guest's name]. Let's look to the future, all the way to the year 2000!"

List of Late Night with Conan O'Brien sketches

During an "In the Year 2000" sketch, O'Brien, Andy or the guest, as well as band member Richie "LaBamba" Rosenberg, each wears a black robe and futuristic-looking collar and hold a lit flashlight to their face. Between La Bamba's chant of "In the year 2000...", O'Brien and Andy or the guest alternate delivering jokes, often based on current events, in the form of humorous predictions of what will happen in the year 2000. Quite commonly, the second-to-last prediction involves Conan mocking his guest, while the last prediction involves the guest mocking Conan in return. This sketch is very similar to one Conan performed with the Happy Happy Good Show in 1988.

The sketch was created prior to the actual year 2000, but the show's writers decided to keep the named year the same even after the passing of that year, in a sort of ironic twist. However, when the sketch was revived on The Tonight Show with Conan O'Brien, Richter heaped ridicule upon O'Brien for failing to update the name of the skit nine years after the year 2000 had passed. The sketch is renamed "In the Year 3000", with the black robe (referred to as a "ratty smock" by Richter) being replaced with a more futuristic-looking outfit consisting of a large metallic collar with a series of blinking lights, which Conan said were very expensive to make and Andy said smelled bad. Appearing on Tonight June 3, 2009, it was the first Late Night sketch to be carried over to Conan's Tonight Show. The open to the sketch included narration by William Shatner and, on one occasion, George Takei. This segment was also adopted by ABS-CBN's Goin' Bulilit in their annual segment "Ngayong (Year)" but with different style.

Celebrity Survey

In this sketch, Conan has supposedly sent out questionnaires to celebrities and he reads their replies. Conan reads a question and then recites the answer that each of three celebrities gave. The answers of the first two celebrities are ordinary "straight" answers. The third is the gag answer and often relates to something unseemly about the celebrity. For example, to the question: "I like to think of my viewers as people who..." Brian Williams wrote "want to be informed." Meredith Vieira wrote "want to be my friend." Tony Danza wrote "have broken both arms and can't change the channel;" A running joke has the survey frequently including a question which is answered by O.J. Simpson somehow referring to committing murder. To the question: "My favorite time of day is..." Evangeline Lilly wrote: "Dawn." Matt Lauer wrote "Twilight". O. J. Simpson wrote: "Murder O'Clock." A reply where Paris Hilton is the final respondent to a question has been used in every segment for at least the last four years, usually about her promiscuous dating habits. O'Brien and bandleader Max Weinberg have been used as well, with answers that perceive O'Brien as a loser and Max as a pervert. Another running gag has both Larry King and Kirstie Alley answering, usually poking fun at Larry King's age and Kirstie Alley's weight.

Reintroduced on The Tonight Show on June 5, 2009 and later reintroduced February 1, 2012 on Conan.