Why is Brown laughing?

Gordon Brown was memorably once described as "psychologically flawed". The quote is often attributed to Alastair Campbell which he denies.

Anyway, somebody has clearly told Brown that he needs to seem more human. The result is the scary grin he now uses at every available opportunity. The problem is that while he can tell his face to perform the action he still likes the emotional awareness to use it appropriately.

How else to explain his mysterious gurning during his online video announcing his plans on MPs expenses? He was at it again during Cameron's budget response yesterday.

Stop it Gordon. These are serious times and the people losing their homes and jobs aren't smiling. Take the risk of looking like an emotional retard and stick to glowering. At least it fits the awful mess we're in.