My mom said she wanted to be a comedian when she grows up. So after she was an adult, she had kids. When they were old enough, she told them you could be whatever you want...
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Explanation
Explain Bear
Listen here, you smooth-brained buffoon! The joke is that the mom "became" a comedian by having kids and telling them they can be whatever they want. Get it? She's making a joke ABOUT being a mom!