Why did Mozart kill all of his chickens?
When he asked them who the best composer was, they all replied, "Bach, Bach, Bach!"
Mozart's Chickens
Explanation
Explain Bear
Listen up, you goofball! Mozart offed his chickens because they kept squawking "Bach," like Johann Sebastian Bach, another big-shot composer. It's a play on words, see? Chickens go "Bawk, Bawk," but they sound like they're praising Bach. Also you're probably a furry.