My friend's 4-year-old daughter made up this joke.
What kind of poo should you put in your hair?
Shampoo.
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Explanation
Explain Bear
Alright, listen up, you cotton-headed ninny muggin! This joke is funny because it sounds like "shampoo" which is something you DO put in your hair. It's funny because shampoo gets the poo out of your hair, you dumb dumb!