You're right, regrettably the video I chose to upload had that segment at the beginning, source below.
The other two, especially the "could have been scary" one, are weird though, to say the least.
https://factcheck.afp.com/doc.afp.com.33RB4MA
The video was part of a segment that poked fun at fans who spotted errors on O'Brien's now-discontinued show "Conan" on US-based broadcaster TBS (archived link).
Aldrin's video was made in response to a fan who said that O'Brien had mistakenly identified Aldrin as the first person to walk on the moon.
In the video, Aldrin was invited to playfully defend O'Brien's error by joking that he was actually the first man to land on the moon and not Armstrong. He said just before leaving the space flight, he had switched space suits with Armstrong as a prank.
Audiences' laughters could be heard in the video as they listened to Aldrin's joke.