There are people who claim that jiu jitsu is one of the best self-defense systems out there, nay, THE tool that will save your life. Others will then quickly point out instances where jiu jitsu is not best suited for the purposes of self-preservation, such as a when a gun is involved, multiple assailants, or a zombie apocolypse.
I would like to point out a few key instances where jiu jitsu, can indeed, save your life:
1. Fighting in zero gravity while breaking into the multiple, complex layers of the human subconscious, a ‘dream within a dream’, if you will, to implant an idea:
2. Fighting a large bird/dinosaur creature to assert your dominance, after transferring your consciousness into an alien like form, an ‘Avatar’ to befriend similar looking beings on a distant planet:
3. Fighting a jealous husband, who also happens to be your boss and the meglomaniac owner of a traveling circus during the Great Depression, as you defend the honor of your lover, who happens to be the star attraction of the show:
...Shit's about to get real.
So take that, naysayers! If you are ever in these situations, jiu jitsu CAN save your life.
A Skirt on the Mat 
You left out the most obvious one. When a crazed/bored billionaire makes you fight a retired american gladiator for his own amusement.
What about when you’re a sociopathic do-gooder serial killer? I mean come on, who hasn’t been there at least a couple times?
