In honor of the current war between the Supernatural fandom (and every other fandom that has joined this noble crusade) and the Beliebers, I humbly present to you:
In Which Wizards Hate Muggle Music
When Harry felt Voldemort enter his mind, he knew there was only one thing to do, no matter how risky it was. Knowing that he was utter shit at Occlumency, The-Boy-Who-Lived-To-Kiss-His-Sanity-Goodbye did the only thing he could do.
From wherever he was in Harry's mind, He-Who-Must-Not-Be-Smelt's eardrums were abruptly assaulted by an ungodly noise.
'And I was like, baby, baby, baby, oh! Baby, baby, baby, oh! I thought you'd always be mine, mine!'
Dumbledore, who was kneeling worriedly beside a screaming Harry, muttered encouragingly, "Fight it Harry, you're strong, you can fight it!" Little did he know, it was not only Harry who was screaming in pain, but Voldemort as well.
"Argh, make it stop!"
If Harry was going down, he was taking Volde-kins with him.
To the people who may enjoy Justin Bieber's music: I apologize if I offended you.
To the people who like Justin Bieber's personality and conduct: get the heck away from my fic, he's a bad dude.