How exciting when you come across one of these archetypal toadstool/mushrooms that you see in fairytale books. Its proper name is Fly Agaric (Amanita muscaria).
This one was in the woods where I live and I came across it while walking my dog Barney. When I got back, out came the mushroom and funghi book – this particular type contains poisons and ibotenic acid which can have psychoactive effects. Some cultures therfore use it for religious and cult practices, notably in Siberia and South America. However, the central Europeans use pieces of it in a bowl of milk and to put on the windowsill. This attracted flies which would die when they came into contact with the mixture and this is where it gets it’s name.