Even better? In the original Japanese the subject of that line is ambiguous, meaning it's telling you either to turn off the console, or turn yourself off - as in, the game is ordering you to commit suicide. Imagine getting that message late at night after playing for a while.
By the way, this isn't real, it's an Urban Legend of Zelda. But it's a testament to this game that anyone who's ever played it believes it immediately.
In the beginning of the game, you and the Law Hero are imprisoned for asking about the demons. When you break out of your cells, you discover the doctors there are Playing with Syringes and performing horrible experiments on prisoners to create mindlessly obedient super soldiers.
The Chaos Hero goes straight for the obvious question about the Cathedral of Shadows and tries to manipulate the demon fusion process and fuse himselfwith a demon.