In case you were living under a rock or happened to be in a coma for the past 24 hours, the 2015 Grammys were last night, Feb. 8. The show kicked off thankfully without a long intro from LL Cool J -- the entire affair was lengthy to start with -- and launched right into a two-song performance of "Rock or Bust" and "Highway To Hell" from AC/DC. The '80s rockers came out blazing with a high-powered performance equipped with pyrotechnics, fireworks and big production. It was a youthful performance all around except for one point: The Teleprompter used by the presenters was also used by AC/DC singer Brian Johnson to help him out with the words to his own song "Rock or Bust," via "Mediaite."