Accidental Re-Reading

I'm not sure if this is a good thing but... have you ever anticipated reading a book to an extent that when you finally get your hands on it, you put aside all other books to read that one just to find out that you already read it? Does that speak to the book being very good or very bad?

This has happened to me twice in the last two months.

The first incident came when after MONTHS searching for a copy of an unabridged versionof Linda Howard's Open Season. All the libraries in the area had abridged versions and I would not hear the short version of the story. I had heard that the book was so good that I didn't want to miss a thing! Well, I finally found it unabridged and what would you know... I had read it years before! Well, I re-read the darn thing becasue I had put too much effort into finding it.

Well the same thing happened to me with Catherine Anderson's Keegan's Lady. I received the book in paperback a while ago but after a recent bad experience with one of Anderson
s books I had decided to forgo the joy of reading her again. I recently ran into an unabridged copy of the book at my library and with the bad experience behind me decided to give the book a whirl. Again, I remember reading the book.

What do you think this is all about? Old age? Bad books ? Both were very good the second time around so I'm not sure what is this all about.

Anyway, Have this happened to you? What do you think it's all about?