I'm trying to find a book that one of our teachers read to us in elementary school. It is either a collection of short stories, or simply one of those novels written in episodic form. It's told in first person by a young boy. He and his brother have various intriguing suburban encounters with alien creatures.
One story (or chapter) involves a peculiar child who comes to the boys' birthday party, and gives them a strange ball that no one can ever pick up, no matter how much they chase after it. Another story prominently features an area of the neighborhood called "No-Mom's Land," and also mentions Sno Balls as the boys' favorite snack. Real useful, I know, but if this sounds familiar, please let me know! It's a light, fun read that I remember liking a lot.