What was the Halloween story in Chapter 4?

From the text:

It was an old story, and it went like this: It was Halloween. My dad was four or five years old and had never been trick-or-treating, and Grandpa Portman had promised to take him when he got off work. My grandmother had bought my dad this ridiculous pink bunny costume, and he put it on and sat by the driveway waiting for Grandpa Portman to come home from five o’clock until nightfall, but he never did. Grandma was so mad that she took a picture of my dad crying in the street just so she could show my grandfather what a huge asshole he was. Needless to say, that picture has long been an object of legend among members of my family, and a great embarrassment to my father.