By turns Ealing comedy, tragedy, thriller, buddy movie and satire, Four Lions is always watchable for the performances of Riz Ahmed, Kayvan Novak, Arsher Ali, Nigel Lindsay and Adeel Akhtar as the jihadis.
Their in-family, in-fighting brings the biggest laughs, and there is much fun to be had from the trademark Morris doggerel; bilious, surreal convoluted outpourings coated in invective that spill out in Urdu (the gang switches between Urdu and English).
However, as a satire on terror, Four Lions seems to be a missed opportunity precisely because of those tonal shifts.
Chris Morris said he started working on the movie four or five years ago after he read an account of a botched terror attack.
He read more widely on the subject, even going so far as to sit in on terror trials, and was amazed by the "staggering" evidence of incompetence on the part of real jihadis. "It was like an Ealing comedy," he said. "I felt there was a missing link and these guys were pretty foolish."