As Katz and Ben prepare to go to Katz's niece Rachel's wedding, Katz discovers that since Uncle Morty is dead, he'll have to dance with Rachel -- and he can't waltz.
In the episode "Mourning Person" (308) we learn that Dr. Katz has an uncle named Morty who is married to the deceased 92-year-old Estelle. However, in this episode, we learn that Ben also has a (late) uncle named Morty (the father of Rachel, Dr. Katz's niece).
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Ben: (to Dr. Katz) I hope you fail. And I hope you embarrass yourself, and Rachel, and everyone at the wedding.
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Ben: Look at him on the (waltz video) box cover – smiling like he's happy. You can tell inside he hurts. He feels pain, too.
Laura: I think it's cause his pants are hiked up.
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Laura: Don't come out until you've cured somebody.
Dr. Katz: Well, you may never see me again.
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:: : Ben rents the entire Death Wish series when he rents the waltz video. This was a Charles Bronson movie five-part serial that featured private citizen Paul Kersey who snapped and became a vigilante crime fighter after violent crimes were committed against his wife and daughter. The series ran from 1974 to 1994.
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