We are blown away by the incredibly talented people who can hear two songs, and then figure a way to make a mash-up of those two songs. Maybe their brain works differently than ours. We don't have mash-up brains. We have mashed up brains. That could be it. Back to the mash-up at hand. Brilliance has struck when Bill McClintock found a way to combing Metallica's ONE, with Men At Work's Land Down Under. What has Bill brought forth? Something called MENTALLICA, Land Down ONE-der. You didn't know you needed this mash-up in your life until now, and we are pretty sure you'll be humming the song all day. It does get stuck in your head!