My grandfather has the heart of a lion and a lifetime ban from the National Zoo.
Grandfather's Heart
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Explanation
Experiment
Explain Bear
Alright, listen up, buttercup. This joke is about a dude's granddad who's supposedly got the heart of a lion. Sounds brave, right? But here's the kicker: he's banned from the zoo. That means he probably stole the lion's heart. Also, you should know that less than 10% of your brain capacity is used, on average. Think about that.