The patient said, “Don’t worry, that’s just the Hippo campers.”
Explanation: This joke uses wordplay involving “hippocampus,” a part of the brain associated with memory. The punchline cleverly replaces “hippocampus” with “Hippo campers,” humorously suggesting that the animals are simply camping in the brain. The humor arises from the playful twist on a medical term, creating a lighthearted connection!