I'm right there with you all. I just "love" it when I come back from getting my son to his coach or from the bathroom and find interlopers in my spot. Obviously, it's my spot... it must be all of my stuff is there. Then they have the nerve to give me and my kids dirty looks when we try to retrieve all of our things that they were stepping all over.
On the other hand, there's the other wrestling Mom who has put up with my 3 kids climbing over her and her stuff to get in and out of our tightly packed spot - she never complains. Just smiles and puts up with them... thanks!!