30 ROCK -- "100" Episode -- Pictured: (l-r) Tina Fey as Liz Lemon, Jack McBrayer as Kenneth Parcell, Alec Baldwin as Jack Donaghy -- Photo by: Ali Goldstein/NBC

No one was more surprised than Jack McBrayer when 30 Rock celebrated its 100th episode. McBrayer tells us in the video below that he’s been expecting his pink slip since the show debuted.

He also acknowledges that not only has his role as Kenny morphed over the years, but the entire cast has changed quite a bit as well - and gotten a little more strange.

Still, don’t count on Tina Fey’s pregnancy and upcoming baby being incorporated into the storylines to add to the oddities. McBrayer says she’s due before the sixth season begins shooting again this fall.

The 100th episode of 30 Rock airs tonight, 10:00 p.m. ET/PT on NBC.