What are some signs that there is faries in your garden?

This answer is completely true:

Fairies live mainly in tree stumps, because of their safeness and largeness. Well, before a fairy moves in, bark from the tree disappears from the stump and all nasty, untidy looking twigs sticking out of the tree will somehow be "magically" cut down (rather neatly too!). After a while, lets just say after about a month or two, many mushrooms will appear in your garden (if your lucky, in the shape of a circle) and this is where the fairies have been dancing.