I was on the Magic and a woman moved another family's belongings so she could sit and watch her child in the pool. The owner of the belongings came back and SCREAMED at the woman, calling her a thief, went and got a CM, filed a complaint, etc. The woman who moved the things just sat in the chair and read her book. The owner of the belongings never did sit in any of the other 4 chairs that held her things.
So yes, confrontations do happen.
I have copied and pasted my story from an earlier thread. The above sounds a lot like my story except that I didnt move the stuff! Were you by chance on an Eastern cruise in Feb

I can totally relate to this at the pool on the Magic It was actually the only part of my trip that wasnt perfect!
One sea day, i went to the pool with my 6 year old. She was in the shallow pool for awhile and I was okay watching her from the deck above. But, when she wanted to move to the deeper pool (the goofy pool i think) I wasn't comfortable not being there to supervise more closely. When I got to the pool there were no "empty" chairs but were several that only had a towel or a pair of shoes on them. I figured no biggie - I would just wait until one opened up.
After about 10 minutes or so, I turned around and saw that there were now two empty chairs. I grabbed one and settled into to enjoy the sun. After about 45 minutes, this lovely gentleman came up and started yelling at me. Literally got in my face and said what a rude b**** I was for "stealing" his chairs. He actually said that he had come and put their stuff on 7! chairs and then went to breakfast. It was at least 45 minutes but honestly closer to an hour later when he came back and was upset someone else was using his families chairs. He accused me of stealing their things also.
Honestly, I truly think that a cast member was watching the chairs and after no one was using them for such a long time, he moved their stuff and that I when I noticed the empty chair.
This grandfather kept yelling in my face about how rude I was etc... I finally said I am sorry you feel that way but I am done talking to you! If you have a problem with it - go find a cast member and ask them if you are allowed to save chairs. For the next two hours, his whole family was giving me dirty looks and calling me names. I even saw him talking to an officer - poor officer was just standing there but you could tell he didnt want to talk to this rude guy!
Sorry - felt good to vent that story! I still get mad thinking about it