Once upon a time and a very good time it was there was a moocow coming down along the road and this moocow that was down along the road met a nicens little boy named baby tuckoo. . . .
His father told him that story: his father looked at him through a glass: he had a hairy face.

I've always liked how A Portrait of the Artist as a Young Man by James Joyce opens, I think because it's loaded with details that leave me with questions.

You might put this one in your final category.

It was a dark and stormy night ahaha

Jk, but "it was the best of times it was the worst of times" always stuck with me despite me not remembering much else about the book