This pic was taken by my friend Mandie in the woods at Edge Hill, near Banbury. Look at the bottom right hand corner...
Ok, for those of you who can't see it (you can be forgiven, the pic was taken on a mobile phone and the quality ain't great) look at the trunk of the tree. It doesn't enlarge too well, but you can see a sort of image of a face. For background, these woods are reputedly haunted ... they are the site of the Battle of Edge Hill in October 1642 (link: http://www.thevickerage.worldonline.co.uk/ecivil/battle_of_edgehill.htm for background).
Mandie swears there was nothing to see on the tree before she took the shot!