Songs of Phrase
Originally called Cross Words, but renamed Songs of Phrase after a viewer's suggestion, this was a competition that was used in place of Rockbusters when Ricky and Steve got too sick of it. It ran for a few weeks in 2003, but Rockbusters couldn't be kept away.
Basically, Karl would take a well-used phrase from the show, e.g. "There's this Hairy Chinese Kid", or "You never see an old man eating a Twix", and form it by splicing together bits of various songs. This came unstuck slightly when he couldn't find a song with "twix" in it, so he had to substitute it for "Mars Bar".
Listeners had to name the artists used in the phrase, which were sometimes as many as 6 or 7, to win the usual tat. It was one of the harder competitions, and often people would win without getting all the answers.