Here's a moment that is fairly devastating when you first watch it but gets completely tragic when you think about it later. Though it's ostensibly a horror film, the tone of this movie is light and frothy, filled with bumbling but likable characters. That is, until Simon Pegg's Shaun is forced to kill his mother, who has been bitten by a zombie. Slightly less frothy, then. But it becomes even more depressing when you realise that, at the end of the film, Shaun is able to save his best friend Ed (Nick Frost), who is also infected, and keep him in his shed. So it turns out he might not have had to kill his mum after all. Yeesh. That'll hurt in the morning.