In the summer of 1990, I bought a book and read it, and put it on a shelf.
In September, I went to Saudi Arabia, and eventually (for a few days) to Iraq.
I came back in March, stayed for a year, than packed up my stuff and went to Germany.
In the summer of 1992, I took the book off the shelf and read it again.
I had forgotten one of the major plot developments, and it surprised me as much as the first time I read it.
That was neat.