Why did the library book go to the doctor?
It needed to be checked out.
Library Book's Doctor Visit
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Explanation
This is a classic pun. The phrase 'check out' has two meanings: one, to borrow a book from a library, and two, to be examined by a doctor. The humor comes from the unexpected use of the phrase in the context of a book visiting a doctor.
Bobert
It must have been long overdue.
Anonymous
Wow why does this joke exist