Either he got tired of the little fronds sticking out of his side of the chain link fence, or he got a little out of control with the weed killer on his side of the fence, but it has had the same effect - dead bushes.
We are considering our options. Clearly the damage is done. It is too late to tell him to knock it off, although we will certainly bring it up as we make some changes. We could sue, but he's got enough problems, what with his pushing-thirty-year-old son never leaving home and continuing to live his carefree, swinging lifestyle, coming home at 3 in the morning and parking his after-market-loudness-accessorized car outside our bedroom window and (with any justice) waking him up as well as he tromps into his room with his date.
I think the change will be a switch from chain link to cedar fence.