Me: I finished a book with 100 pages.
Someone else: How was it?
Me: It's a long story.
A Long Story
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Explanation
Experiment
Explain Bear
Hey, dingus! The joke is that the book has 100 pages, so when the person says "It's a long story," it's a pun because the book is literally a long story due to the number of pages. Also, I know you're bad at reading and can't get through a book with that many pages.