One of the earliest references on television, 1961, is in the The Twilight Zone episode, The Odyssey of Flight 33 where the radio operator actually says, "No soap" when he can't reach anyone on the radio.
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Over the years the joke has become widely known and entered popular culture in other forms, including a shower radio labeled "No Soap-Radio!" on a The Simpsons episode ("Homer the Heretic"), a popular podcast named after the joke, and a band with the name appearing at the Crazy Horse on a The Sopranos episode ("Pie-O-My").
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