A post-apocalyptic beginning

I just came up with what I think is a good first line for a book and a not quite so good second line:

"Our parents used to ask each other if they remember where they were when a man first walked on the moon or when the Berlin Wall fell; we used to ask each other where we were when the World Trade Center fell; now, if we can find anyone to ask, we ask where we were when the world ended."

"I remember where I was when the world ended; I was in a McDonald's, and I didn't even like McDonald's."