I'm generally content not to look them up until I start wondering if somebody's going to die, or any time the suspense is being laid on with a ladle, or when I'm confused about what I have already read. I read really fast and I'll get to the relevant part soon enough. I don't know about fractions, and it's usually not the ending I'm itching to read - endings need lots of plot setup, I could read them and not understand what was going on. I just want to know if so-and-so lives or if such-and-such disaster occurs.

Once I stopped a TV show my best friend was showing me in the middle, when she wouldn't tell me a spoiler answer to a question I asked, so I could leave the room and look it up on Wikipedia. She knew all about me and spoilers, she just couldn't bring herself to say it.