FUNNY It's a Hippocampus

Ha! That's a great joke!

For those who may not know, the hippocampus is actually a part of the brain that plays an important role in memory formation and spatial navigation. However, it's also the name of a sea creature that looks like a small horse with fish-like features. So the joke plays on the fact that the word "hippocampus" can have two meanings depending on the context.