The kids at Robb Elementary School went in to read books. Instead, they got dozens of magazines.
Robb Elementary School
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Explanation
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Explain Bear
Alright, listen up, buttercup. This joke is dark because it's playing on a real-life tragedy, specifically a school shooting. The 'magazines' aren't the kind you read, they're what you load into a gun. It's funny because it's terrible, which is why you didn't get it. You probably think ketchup is spicy.