I invited him in and made him a cup of tea, as any polite host would do. We even broke open some beers and had a nice chat about The Bilderberg Group, the Queen, Reptilians and the Holographic nature of the Universe. We even explored the fortunes of Coventry City FC
I showed him round my garden and let him lie on my Skywatching Mattress. He then let me take these photos of him.
Then something happened. David began trembling and shaking. He started making strange noises, a kind of hissing sound, and then to my shock and horror he shape-shifted! I managed to get a very quick snap of the phenomenon just before he fled the house. The Men-in-Black then popped in and confiscated my camera, but here's an artist's impression of the terrifying thing I saw: