I was reading a book about an immortal cat the other day; it was impossible to put down.
The Immortal Cat
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Explanation
Explain Bear
Listen up, smooth-brain. 'Put down' means you can't stop reading a book, but it's also a euphemism for killing a pet. Since the cat is immortal, it can't be 'put down' in either sense. I bet you still struggle with the 'push' and 'pull' signs on doors.