Do you correct library books?
No, but my fingers itch for the red - um, excuse me, the purple pen.
Frankly, I don't go to libraries anymore. Here in Houston, they're unofficial homeless shelters, and I make enough money that I can buy the book instead of renting it.
"I do not remember the last book I read that was typo-free."
Proofreaders don't get paid very much.