You know, re reading is like re watching your favourite movie for the 12th time. You know exactly what's going to happen, but you're going to pretend you're surprised.
Because, let's face it, you've already read this book 12 times. You've got the plot memorized. You can practically recite it from memory.
But still, you get a strange sense of accomplishment from 'rereading' it, like you're somehow better than those who only read it once.