In Winnie the Pooh and the Blustery Day, a 1968 Disney featurette, the voice of Tigger was performed by Paul Winchell, whose wife Jean Freeman suggested that he ad-lib the line.
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"Ta-ta for now" was brought into popular use in the UK in 1940 in the weekly radio comedy It's That Man Again by the character Mrs Mopp, who ended every scene with it.
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In the 1966 Batman television episode "Better Luck Next Time", Catwoman says TTFN, and then has to explain the meaning to Batman.