That claimed they were unaware of it! I asked him to fix the wall or put more grass in on that side more than a few times.
DH didn't want to start anything with neighbors, so his solution was to hire someone to dig out all the sand and re grass our back yard. That wasn't going to work, as the sand was still going to shoot down and over the wall....and take out the new grass with the next rain. We'd already replaced the grass on the side a few times. I considered DHs solution to be like that saying, "Insanity is doing the same thing over and over, expecting a different result."