I just remembered a wonderful documentary film called Touching the Void about 2 climbers descending a summit in the Andes, one of them, Joe, falls and breaks his leg and the other has to leave him to get help. When Joe is lying in the freezing cold he becomes delusional with the pain and ends up with the song 'Brown Girl in the ring' by Boney M going around his head. It's the most bizarre earworm but it sort of keeps him focused and with it as he battles for survival.

It's an amazing film and I recommend it.