(hat-tip: JoBlo, TwitchFilm)
Y'know how I know? Because they just made THIS movie:
Title: "The Machine Girl." Premise: After a Japanese Schoolgirl sees her boyfriend murdered and gets her arm hacked off by a family of Yakuza Ninjas (!!!), she embarks on an ultra-violent revenge killing-spree using a high-powered machine gun mounted in place of her missing arm.
I live for this stuff.