Blizzard took down neighbor's tree close to border in his back yard into my yard. Figured I would have to pay for removal but they called and said they were taking care of it.
Same thing happened a couple of years ago when one of my trees fell into their yard and I paid for it. The tree actually spanned his driveway and he and his BIL cut that part before I could get a tree cutter in.
Good neighbors are like that as otherwise if it is in your yard it is your responsibility unless you can show it should have been removed as it endangered your property or house. One of my BIL's had insurance pay for tree removal that endangered neighbor's garage.
Just brought it up here as an interesting situation.