Improvised weapons from around the world. Some are pretty good. Others look like they need a buff and polish before being thrown off the stern.
Be warned, the site will draw you in. Human ingenuity will find a way to accomplish a task. You can try to outlaw a thing, but it's impossible to outlaw the knowing of things.
I picked one to show you. It's one of the better looking examples, collected in Australia in October of 2017. A homemade pistol with a homemade silencer.