Someone got ahold of Harry Potter and the Half-Blood Prince before it was supposed to be released to the public and scanned pages 596, 597, and 606 to prove that Snape killed Dumbledore. The pictures spread like wildfire and ruined many Harry Potter fan's lives.
Video: Someone videotaped(poorly I might add) himself driving past a crowded bookstore at 1am and shouting "Snape kills Dumbledore!" at all the Harry Potter fans outside, ruining the story for them.
2: SNAPE KILLS DUMBLEDORE PAGE606PWNED
1: OMGOMGOMGOMGOMG u n00b
Driver: Hey! Snape kills Dumbledore!
Girl: Ooooooooooh you bitch! Bitch!
It is also a fad on ytmnd. Many pages were created with this information, sometimes in humorous ways.
<Dude2> What the hell?! I haven't read it yet!!
<Dude In Car> Hey! Snape kills Dumbledore.
<Girl> Nooooooo! You bitch! YOU BITCH!!!