Every comic has “go-to” routines that serve as evergreen filler material. If you can’t think of a gag this week, just set up a lasagna gag (Garfield) or a painfully bad pun gag (Pearls Before Swine) or in this case, a guard in front of a cell door talking to an unseen prisoner. Yeah, I used this a lot. I don’t promise not to go there again…