Funny Fungi

Not sure what type of fungi this is, however I found it on a fence post in Boars Hill and it looked like someone had stuck it on the top of this post. The position is obviously great for it as it is looking nice and big and in a very healthy state. Anyone know why these things just start growing in this type of location?

On a completely different subject I spotted this bumper sticker which I think is typical at the moment.