A friend is someone who will bail you out of jail. A best friend is the one sitting next to you saying "boy was that fun."

This anonymous quip draws a humorous distinction between ordinary friendship and the deeper, more complicit bond of a “best friend.” A friend offers support after trouble—someone dependable enough to help you recover from consequences. A best friend, by contrast, is portrayed as a partner in mischief: not merely rescuing you, but sharing responsibility and even delight in the shared experience. The joke relies on exaggeration (jail as a dramatic marker of “trouble”) to celebrate intimacy, loyalty, and shared stories. It also lightly critiques friendships that are only transactional, suggesting that the closest relationships are forged through mutual adventure and a willingness to stand together when things go wrong.