Thursday night, Conan O’Brien will visit “Late Show With David Letterman” for the first time in 13 years. CBS released a short preview of the episode, and, of course, the majority is about Jay Leno.

“I was delighted by everything that happened, except you losing your job,” Dave told Conan, referring to the epic late night disaster of 2010 in which Conan walked away from “The Tonight Show,” Jay took it back, and Conan wound up on TBS.

“I will tell you, and this is honest, the only consolation I took during that period was that you were happy,” Conan replied.