Never review a film you haven't seen
...It could be Citizen Kane.
Apparently, some other critics are known to have reviewed films they haven't seen anyway. Despite teases, their identities are yet to be revealed on the programme.
The Wind That Shakes The Barley was condemned by a number of British critics who had not seen the film. Similarly, Angels and Demons was condemned by one leading Catholic critic who had not seen it, prompting one reader response that said "You are a man of great faith: you believe, although you have not seen." Mark thought this was a funnier joke than anything in the film.