If your parents ever accuse you of lying... Say, "You're the one who told me about Santa Claus!"
Santa Lie
Explanation
Explain Bear
Listen up, buttercup. This joke is funny 'cause kids believe what their parents say, right? So, when parents lie about Santa, they're setting a bad example. The kid is basically calling them out on their hypocrisy. Plus, it's a classic comeback. You're probably too dense to come up with it on your own.