OMG! Have this problem with my next-door neighbour's boy, he loves football. When I first moved here, I would always throw them straight back, but 2yrs on and a lot of hard work on my garden, with all the beautiful blooms now showing, it's a very different ballgame
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He has damaged lots of flowers, knocked over my bird bath and damaged a lovely Hosta that was next to it and had grown so big, I was so pleased with it. I had 2 large ball prints on my patio doors and the first fence panel has lots of big cracks in it from his ball bashing it, I have even been out there when he was bashing his ball against the fence panel, I told him to stop!
I now have about 7 footballs down the side of my shed' between the fence & the shed. If he asked for them back, I will tell him No, you've done too much damage to my garden.
The other bug bare is these big trampolines, they have one next door and take great delight in jumping high, goading my little dog to bark at them! I knocked and asked the dad to stop them doing this as I need to keep my dog from barking. Before the trampoline arrived, they would sort of hang onto the fence, pulling themselves along, with their heads above the fence, doing the same goading of my little dog. We put some higher fences in and then the trampoline arrives
. I am friendly with the family though and when my GDs come on a Friday, they all end up playing together.
On top of that, there is another trampoline at the back of my garden from the garden behind mine. There is only a small gap looking into the top of their garden, but that's where their trampoline has been put! The C don't go on it much, but last time they must have seen my little dog and started the same game as my NDN.
I have a new neighbour coming on the other side soon, I do hope there are not more small C!