Anyone who grew up in Britain (or Ireland and had access to British TV shows) during the 70, 80's or early 90's will probably recognize the TV show Rainbow. A completely harmless show aimed at really young children, their antics were probably as famous on the British Isles as Sesame Street was in the US.
In 1997 I happened to be flipping channels late one night when I came across a show called TV Offal and they were showing a set of previously unaired "pilot" episodes of TV shows. One of them happened to be a rather risqué joke episode of Rainbow (not actually a pilot, but who's quibbling) that started with two of the puppets describing peeling a banana .. and it continued from there.
This was, and still is, one of the funniest things I've ever seen, so I wanted to make sure I shared it :-)