Like for a lot of aspies, my favorite pretend game was a solo one; I was 4 to 6 at the time. I would sit in empty gazebo or a sandbox on a playground, and pretend I was inside my own house. Every place in the "house" was a distinct room, and the perimeter was a reinforced concrete wall. There were times when I played that game for over an hour, contently sitting in the "house", surrounded by numerous posessions, fortifications (such as massive locks on doors), and guard dogs outside. Throughout the game, I talk to myself as I described each and every thing.
Of course, other kids would enter the sandbox or the gazebo, since, after all, it was a public playground. Every time, I would become upset, because they were entering my "house" and disturbing the game. A few kids offered to join the game, since they thought it was fun. I brushed them off (in retrospect, probably rudely), since in my opinion at the time, a game isn't fun when you can't do things your way. Some tried to reason with me, explaining that it was public property; others taunted me "hey, I'm in your house, and I'm going to touch everything".
I had to stop going to two playgrounds because of this. Eventually, my parents had to lecture me on how to act on playgrounds, to avoid getting bullied. In time, I dropped the "house" game, simply because it took way too much effort to maintain. Looking back, I probably should have had predefined roles for kids that offered to join the game. Buy hey, I was four and an aspie to boot, so can you blame me?