I see so many re-imaginings of metal songs going around online that I barely think to post any of them anymore. However, Sambo Ray, Jr., also known as Sam Westphalen, has uploaded some amazing one-man covers of iconic metal songs. It's billed as "guitar percussion," but fails to mention that he actually plays both--guitar and percussion, with lots of slapping and hammer-ons--at the same time, with just two hands. I've never heard anything like this. If I ever saw him busking, I'd probably miss my train.
Pantera, "Mouth for War"
Slayer, "Seasons in the Abyss"