1. A soothing song with which to lull a child to sleep.
2. A kick-ass book about how these songs can kill, written by a guy named Chuck Palahniuk who also wrote the novel Fight Club.
Yes, it is highly unknown that a lullaby can not only make a child sleep, but kill them, too.
Book that beats the shit out of Death Note. Story of a man who finds out that a lullaby he sung to his late son kills, and he and a friend try to keep it out of the hands of a psycho.
Lullaby beats the crap of Death Note... fuckin' weeaboos.