Every time you sit back and rock with laughter at the efforts of 'The Office', 'The Royle Family', 'Arrested Development' and 'Modern Family', send a silent prayer to one man.
Because it was Christopher Guest - always Nigel Tufnel to many - who (arguably) pioneered this much-borrowed style of film, with his genre-changing efforts in original 'rockumentary' 'Spinal Tap' and the more recent 'Best in Show'.
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To celebrate the DVD release of his BBC comedy 'Family Tree', out on 23 September, we take a look back at just some of Guest's best moments...
Christopher Guest's 'Family Tree' is out on DVD on Monday 23 September from Universal Pictures (UK).