Heavy metal music has done much good for the world, introducing us to the talents of Bruce Dickinson on vocals, Jeff Hanneman on guitar, and the sartorial delights of a really close-cut stonewash jean.
Unfortunately, for fans of the genre it has also been responsible for much ill in the world too.
No, we don't mean the music (though much of the output between 1998 and 2004 is fairly questionable).
We're talking about the genre's ideas for robots.
While browsing our favourite music streaming service this week, we noticed an album which reminded us just how many terrible ideas for androids, cyborgs and mechanical humans metal bands have come up with over the years.
We've pulled some of our favourite examples below. Let us know if we've missed any. And in future if you see a long-haired Viking wandering around Maplin with a Flying V in one hand and a Raspberry Pi in the other, for the love of all humanity do everything you can to stop them.
Striker - 'Armed To The Teeth'
A skeleton of a carnivorous canine returned to life as a machine-gun and dual-flame-thrower toting, homicidal battledroid? Doesn't seem all that sensible.
Exodus - 'Shovel Headed Kill Machine'
Similarly, this robotic death tank with optional slaughter plough also seems misguided. Especially if somebody works out how to 3D print one.
Riot - 'Thunder Steel'
Having said that, by comparison Riot's idea Exodus look positively Apple-like in their vision of functional murder weapons. This robotic tank has its basis in a decent enough idea, but literally sticking half a humanoid holding a (drop-able) gun onto a ridiculously small motorised tank is not going to do much for anyone. And we're pretty sure the Campaign To Stop Killer Robots would be against it.
Iron Maiden - 'Somewhere In Time'
Undisputed gods of the heavy metal world they may be, but designers of responsible android technology they are not. With this famous album cover, Iron Maiden demonstrate why using advanced cyborg brain implants and robotic skeletons is not a good idea if you're going to give it to an <a href="http://en.wikipedia.org/wiki/Eddie_the_Head">oft-reincarnated zombie demon</a>.
To some it might appear that these classic cyborg robotic aliens are on the right lines when thinking about the next evolution of (ethically problematic) battlefield drones. But then you realise they're being easily defeated by a pair of lions in lioncloths. We can do better.
Scanner - 'Terminal Earth'
The final humiliation. A once proud mechanical marvel reduced to the status of a down-and-out, frizzed by urinating dogs and watched piteously by a traffic warden.
Aerosmith - 'Just Push Play'
For good or ill, the idea of human-like robotic ladies is nothing new, from Fritz Lang's 'Metropolis' to the wandering minds of teenage boys everywhere. But Aerosmith's version seems in particularly poor taste, and would probably not lead to the advancement of human enlightenment if implemented.