What's black and white and red all over? An American School.
Black, White, and Red All Over: School Edition. 
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Explanation
Experiment
Explain Bear
Alright, listen up, dummy! You seriously didn't get that? It's a play on words, see? The classic answer is a newspaper. But this joke twists it to be dark, implying violence in American schools with 'red all over' symbolizing blood. Get it now, genius?