This isn't really how you'd imagine this list to start out. Monty Python's tame comedy stylings haven't often been the cause of controversy, but in this case - Life of Brian inspired bans in multiple countries, X ratings, and mob outrage at its depiction of religious events.
Featuring Brian of Nazareth as a boy born on the original Christmas next door to Jesus Christ, he spends his life being mistaken for the Messiah. He's not though. He's just a very naughty boy.
A staple of both cinema and television in Britain, the claimed-to-be blasphemous content split people down the middle. Only as recently as 2008 were bans lifted off the film, and it looked back upon with a sense of warm nostalgia rather than anger. It's hard to think considering Life of Brian has routinely been listed as one of the best comedy movies ever made that it was treated with such vehemence over the years.