Michael sez: "[Here's a] clip from a British children's television show (apparently) that has more sexual innuendo than anything I've ever seen in my life."
Rod (to Jane): "Do you want to blow on my pipe while I'm twanging away?"
Jane: "Oh no Rod, I was blowing a lot with Roger last night. But would you
like to play with my maracas?"
Zippy: "No, let's just pluck away with our twangers."
Bungle: "Yes, it doesn't matter what size your twanger is."
Zippy: "I've got a big red one."
George: "I've only got a tiny twanger. But it works well and I like to play with it."
Geoffrey (to viewers): "Well, have you got your twangers out? And remember,
you can bounce your balls at the same time. If you haven't got any balls,
ask a friend if you can play with his.
UPDATE: Michael sez: From imdb: 'There are currently rumours doing the rounds that Rainbow was nearly axed due to an 'obscene' edition being made that contained a lot of sexual innuendo about balls, twangers, plucking and so forth, a clip of which was shown on a late-night Channel Four comedy show. In fact, this edition of Rainbow was never meant to be broadcast 'properly', it was an in-joke performed by the cast and crew for a Christmas party at the production studios. It has long been a tradition within the British television industry for the videotape editing department to produce 'Christmas shows' consisting of bloopers, X-rated moments and suchlike fare to be shown at the seasonal gatherings, and the 'adult' Rainbow was produced with that in mind.'