Grandfather's Heart

My grandfather has the heart of a lion and a lifetime ban from the National Zoo.

Grandfather
Heart
Animal
Family
Lion
Zoo

Explanation

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.