Ftumch is the name of a devil, played by David Rappaport

David Rappaport

David Stephen Rappaport was an English actor, probably one of the best known dwarf actors in television and film...

 who appears in the third episode of the first series of the British sitcom The Young Ones

The Young Ones (TV series)

The Young Ones is a British sitcom, first broadcast in 1982, which ran for two series on BBC2. Its anarchic, offbeat humour helped bring alternative comedy to television in the 1980s and made household names of its writers and performers...

, entitled Boring

Boring (Young Ones episode)

Boring was the third episode of The Young Ones, a British sitcom. It was written by Ben Elton, Rik Mayall and Lise Mayer, and directed by Paul Jackson. It was first aired on BBC2 on 23 November 1982....

, first shown on BBC2 on 23 November 1982.

The premise of his appearance is that if anyone utters his name then he shall appear, yet he doesn't appear very often because 'Ftumch' is such an unusual name. He is heard to say 'No-one ever says Ftumch. Why couldn't I be called William?'