While testing out Grandpa's television-based invention that allows them to spy on others in the house, Herman overhears a snippet of conversation between Lily and Marilyn that he interprets as Lily being pregnant. We know from the start, however, that Lily and Marilyn are simply discussing watching their doctor's child as a favor for him while he's on vacation.
That sets the stage for the episode, which primarily consists of Herman trying to subversively gain more information about his expected child while he attempts to leave himself open for Lily to drop the bomb. It's a classic sitcom scenario based on misinterpretation, which stems back to pioneering series such as "I Love Lucy" (1951) and "The Honeymooners" (1955).
"The Munsters" often had subplots, and the writers obtain one here in a subtly unusual way--by instead having characters trying to achieve conflicting aims while in the midst of an interlocking main plot. While Herman is trying to position himself into receiving full revelations about his new son or daughter, Lily is trying to prepare for his birthday. Herman's birthday present is a doozy--what we later came to know as the Munsters family car; it's probably my favorite car from the entire world of film and television.
In addition to containing a very funny cameo from comic actor Paul Lynde, Rock-A-Bye Munster features Fred Gwynne at the top of his Herman Munster game, as he demonstrates just how humorously and bizarrely out of it Herman can be.
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