Competitors on the long-running show, in which people make the longest word from a selection of letters, were given "DTCEIASHF".
But they were given a new set of letters and asked to try again when Cambridge University student Jack Hurst, 18, produced the word "s***face".
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Hide AdChannel 4 said: "Countdown is a daytime programme and this particular word was not deemed appropriate for a daytime audience so not included in the show."