You've got a body inside you. It's called your bones.
Body and Bones
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Explanation
Experiment
Explain Bear
Listen up, buttercup. This joke is so dumb it's kinda funny. It's saying you got bones inside your body, which, duh, everyone does. You probably didn't know, because you're too busy picking your nose or something. But hey, at least you learned something new today, even if it's the bare minimum of human knowledge.