A few years ago, I was in the Searay and went to go visit a friend at Tobay. Same situation, boat left the slip and left a line across it to hold the slip. I checked with my buddy to make sure it was ok to use the slip for an hour as another one was going to open and I would move. Kids who run the dock said no problem. I never changed his lines or moved his lines, I used what was there and put them back where I found them. I added to what I needed.
Well 15 minutes after I tied up, I get a boat sounding his horn, I looked over and its the guy whose "slip" I was in. So I get on the boat and I go to move and now I am sitting drifting waiting for another boat to pull out so I get his slip. I finally get a slip dock, as I am tying up this looney jumps onto my boat and starts screaming at me. Calling me every name in the book for "stealing his slip" I said when you are done yelling and you can talk to me come back and talk. He refused. I told him to get off my boat before I remove him from the boat. (im not a big guy, but when I lose my temper watch out). He finally gets off the boat and now the kids who run the dock finally came down to see whats going on. Everyone around explained what they say and all was good.
The guy never came over to apologize for freaking out.