I get this a lot when I'm rereading a series, simply because I like the second or third book more than the first one. It also happens when I'm reading a series for the first time and I can't wait to see what happens to the characters.

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This might seem crazy but I like to open up to a random page in the next book and read it. Keeps me on my toes wondering how the characters got to that stage and encourages me to read my current book so that I can get to the next one!