You can lead a horse to water, but a pencil must be lead.
Horse and Pencil Lead
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Explanation
Experiment
Explain Bear
Alright, listen up, buttercup. This joke is playing on the word "lead." You see, you can LEAD a horse, like guide it. But a pencil? It's got LEAD inside, that black stuff you write with. So, it SOUNDS the same, but it MEANS different things! Get it now, Einstein?