According to Google, the Japanese shamisen is a traditional three-string instrument developed as a copy of another Eastern instrument from China. Think of it as a guitar with half the strings, and a pick the size of your forearm. With a really unique sound, it's not messing around.

Skip forward a few hundred years, and Metallica releases Master of Puppets. Tie the two together, and you get this little nugget that is both epic and ridiculous. Honestly, they need to toss a pickup on that thing and send it through warp-drive!