Why did the fish blush?

This fin-tastic joke gets its splash of humor from a classic case of wordplay. The setup asks why a fish, a creature not typically known for its modesty, would suddenly turn red. The punchline, "Because it saw the ocean's bottom," cleverly plays on the double meaning of that last word. For a fish, seeing the *literal* seabed is just another Tuesday in the deep blue sea. There's nothing scandalous about a sandy ocean floor.

However, our human brains, when presented with the idea of "seeing a bottom" and "blushing," immediately jump to a more intimate and embarrassing anatomical interpretation. The joke relies on this anthropomorphic projection, giving the fish human-like sensibilities and a sense of propriety about something utterly natural in its own world. It’s the delightful absurdity of imagining a fish suddenly becoming flustered by its own environment, all thanks to a simple, well-placed pun, that makes this underwater quip so charmingly silly.