Simon Pegg and Nick Frost's screenplay for Paul reads like the sort of film their characters from Spaced would write. But then, apart from fictional flourishes to make the characters work in a sitcom, Tim Bisley and Mike Watt have always essentially been Pegg and Frost themselves. Some might point to this as a weakness of range, but it takes courage not only to play oneself on-screen but to put a friendship up for critique before the eyes of millions.And if Paul accomplishes nothing else, it proves that Pegg and Frost share the finest chemistry in contemporary comedy. Married couples do not have the same energy and believability on-screen as these two dorky Englishmen; even when delivering the most obviously set-up punchline, their interplay makes every exchange fresh, natural and, nine times out of 10, hilarious.