The Dick Van Dyke Show: 4.5 (1964)

Synopsis
In the first episode of a two-part story, the staff of "The Alan Brady Show" is invited to put on a performance for the men in the state penitentiary. The convict arranging the show is Lyle Delp (Don Rickles), who turns out to be an old friend of Rob (Dick Van Dyke) and Laura (Mary Tyler Moore). In flashback, Rob recalls how he and a pregnant Laura first met Lyle when the hapless habitual criminal tried to hold them up at gunpoint (or rather, "comb-point") in a stalled elevator. ~ Hal Erickson, All Movie Guide