My grandpa has the heart of a lion,
and a lifetime ban from the zoo.
Alright, listen up, buttercup. This joke is all about how the grandpa supposedly has the heart of a lion, meaning he's brave, right? But the punchline flips it – turns out he's banned from the zoo, implying he stole the lion's heart...literally. So he is not brave, he is a thief and probably a killer. You are probably also a thief but you steal something else. My honey!