When I was young, before the county cut all trees that lined the road that I lived in, the branches of the trees on both sides of the road covered the road like a tunnel. We had a treehouse in a large oak tree on the far side of the house from the road, so it would have been several hundred feet from the road. The treehouse predated me, so I imagine one of my brothers built it but it was there throughout my childhood years. The treehouse had a window facing the road, and since the trees that lined the road didn't have any lower branches, we could see anyone coming down the road from the treehouse. My cousins and I ran several strings from the treehouse, which were held in place on bent nails, while the other end of the string was attached to water balloons that were draped over branches of the trees that lined the road, so if we detached the strings from the ends in the treehouse, the balloons would fall down onto the road or, hopefully, onto the heads of any of our female cousins who might be walking down the road. Of course, anyone could be a target, even my mother. A lot of them missed, of course, and some of them hung up on the branches and didn't fall, but we scored several direct hits over the summer.