Fly on the wall documentaries often make great viewing, but they seldom reflect well on whatever or whoever the fly is watching.
Back in the late 1960s, The Beatles invited the cameras in to watch them rehearse and record an album. The album 'Let It Be' turned out to be pretty good - but the film captured the bitter, bickering disintegration of the band before our eyes.
Years later the Football Association decided it might be a good idea to allow the cameras to record the behind-the-scenes story of England's march to the 1994 World Cup finals under the management of Graham Taylor. There was just one problem - England did not qualify.
The subsequent film almost ended Taylor's managerial career; it probably did finish that of his assistant Phil Neal, and it included the pitiful sight of Paul Gascoigne blaming a "crap ball" for a sorry performance against San Marino.