You know those wooden planks which are attached to roofs at one side. Well apparently they are there to stop big lumps of snow sliding off onto sheds/conservatories or other outbuildings near houses.
They are NOT there to catch the balls that you throw onto the roof, or over roofs. As a child I would try and see if I could throw a ball (usually a tennis ball) over the roof of the house and it would usually get trapped on the wooden board. Putting a swift end to my shenanigans.
And I only discovered this recently, as in, a few weeks ago.
I am 34.