Greg and Marcia think Peter will keep on spying since his punishment was no punishment at all. They decide to test their theory by planting a message about a surprise party for Peter on the tape recorder, to see if he listens to it. Mike and Carol learn of this and sabotage the revenge by throwing him an actual surprise party. 

This week's episode: "The Private Ear" The Brady Bunch S3 E09, originally aired November 12, 1971.

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