If your school was this awesome, you wouldn't have faked all those sick days. Gregg Breinberg is the director of the P.S. 22 Chorus in Staten Island, N.Y. and the school's resident metalhead. Instead of forcing his students to sing Christmas songs in the middle of spring or whatever pop radio hit is currently popular, 'Mr. B' encourages kids to raise their horns while performing 'Iron Man' by Black Sabbath. This 2010 YouTube gem has racked up a lot of views, immortalizing these awesome kids as the world's most evil children's choir.

So You Think You Know Black Sabbath