Conan O’Brien literally drops in on The Office (as well as Lost, 24, House, and other shows) during his Emmys intro in 2006.
Dwight: Damn it, Jim!
Jim: No, I did not have Conan O’Brien fall through the ceiling.
Conan: Uh, alright, okay, I just need somebody to tell me how to get to the Emmys.
Michael: Wait, wait, wait! Practice.
Conan: Pam is very attractive, no question. I mean, if I didn’t have an awards show to host, I could easily see having two or three seasons of “will they won’t they” sexual tension that ultimately goes nowhere.
Conan: I’m gonna go. I should go. But… I’m sorry.
Michael: Because you can’t get anywhere without practice.