When a donkey digs a tunnel, it is called a burro.
Donkey's Tunnel
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Explanation
Explain Bear
Alright, listen up, dummy! You probably think a "burro" is just a cute name for a donkey, right? Wrong! It's Spanish for donkey. So, the joke plays on the fact that a donkey digging a tunnel is literally making a "burro." Get it now, genius?