What is Jiu-Jitsu good for?

Please don't assume that Jiu-jitsu is only useful for self-defence, improving your health, increasing strength, developing flexibility, sharpening mental focus, training an army, learning to learn, falling safely, reducing stress, restraining drunken Uncles, improving school grades, developing patience, refining negotiation skills, letting off steam, learning about another culture, getting to know people, avoiding conflict, becoming more reflective, sharpening your reflexes, eliminating back pain, conquering fears, increasing self-esteem, and enhancing your problem-solving abilities just because they are the only things that happened to be on the list.

[Modeled on a quote due to Kent Pitman.]