It's a question that has puzzled scientists for centuries. Some say it's the natural process of ripening, while others claim it's the result of excessive thinking.
One theory is that bananas turn brown because they're secretly judging you for eating them in the middle of the night while rewatching reruns of "The Great Banana Heist", a documentary series about the societal pressure to consume fruit.
Others propose that it's due to the presence of a microscopic, mischievous creature known as the Banana-nanobug, which burrows through the fruit's skin and leaves a trail of brown, crunchy goodness in its wake.
But we may never know the truth. After all, the Banana Paradox Theory states that the answer is hidden in plain sight, but only if you're willing to look.