A charming documentary about obscure Christmas music, "Jingle Bell Rocks" opens with footage of a very tall, somewhat ungainly man wandering into that rarest of retailers - the music store - and riffling through a bin of CDs.
"Sinead O'Connor singing 'Silent Night'? Buck-99? I'll take it," he says, and puts it in his basket. Flipping through each bin, he is frantic and frenzied and seems lost in his own head.