Some years back we had a survey done on some property that we had just acquired. There was a 20 acre parcel in the middle of it that we did not own, with a cabin on it . The survey showed that the cabin was on the 20ac. but just barely - within 1foot of the boundary. However, the outhouse (half moon hotel) was on our property. When I went to talk to the cabin owner he had a good sense of humor. " I always thought the cabin was on the other side of my property. I see you got my outhouse, but since its an outhouse I figured I had squatters rights."
We were both happy to resolve the whole thing by trading equal strips on both sides of his 20 acres so that his cabin & out house were well inside his property & we both ended up with the acreage we started with.