Children of Bodom do Britney Spears Harshly

This is, by far, one of my favorite cover songs EVER. If you're curious, the word Perkele from the first line

cause you're a loser PERKELE

is either a) a reference to the Finnish god of thunder, or more likely b) a curse word associated with the devil. If Finnish etymology is really your thing, you can begin studying Perkele over at the Urban Dictionary.