On April 24, 1977 Piero Umiliani's original 1968 version of "Mah Na Mah Na" entered the UK charts, thanks to a performance on The Muppet Show. It would peak at #8. The song was originally written for a Swedish sex-ploitation documentary called Sweden, Heaven and Hell.
The original version charted in the US in 1968. In 1969 Sesame Street used their own version of "Mah Na Mah Na" in a skit
The Muppet Show revisited the skit on the program's first episode in 1976.
Things quickly got weird
Since then, there have been countless versions of the song...
All used for comedic effect...
As recently as last year.