What is a book you finished years ago but you still find yourself thinking about at random times during the day

Every once in a while I will be doing something completely normal like washing dishes or walking to my car and a specific scene or a line from a book I read a decade ago will just pop into my head It is amazing how certain stories just live in the back of your brain forever even if you forget the names of the characters or the exact plot details What is that one book for you that left a permanent mark on your mind and why do you think it stuck with you so much longer than others