Nativity 3: Dude, Where's My Donkey
"Christmas comes but once a year - and brings with it films that make you want to flee the country" - Mark Kermode, BBC Radio 5live
Hideous threequel part of the Nativity triology (the first of which Mark Kermode liked, the second of which was awfulness in Wales). Martin Clunes gets hit on the head by a donkey, which makes him forget a) his daughter and b) that he is engaged to Catherine Tate, because that's how serious brain injury works.
A listener named Jason in Leigh-on-Sea wrote an email so good that it triggered the suggestion of Wittertainment merchandise as a prize, after he compared the film with, of all things, Christopher Nolan's Interstellar:
"One of these films was a sprawling journey between far-fetched scenarios with an incomprehensible finale that supposedly about the relationship between a daughter and her long-distant father, and the other was Intersteller"