Do you have a pet peeve when it comes to book reading?

I do. It's when you're invested in a series, and you get to the last book and realize at the end of the last book that the story isn't over, yet the author hasn't written in years. This happened to me recently on a 5 book series. The whole thing was left open on a cliffhanger. I got upset enough that I wrote the author. Got a response that they are working on the final book, but it's like come on, it's been over 10 years. Facepalm.

What about you GAG.
Do you have a pet peeve when it comes to book reading?
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