I don't know about you, but 1 guitar neck just doesn't seem to be enough for me.  I'm a two or three neck minimum kinda guy.  These 8 dudes take it a step further and pretty much gang bang this 8 necked guitar.

Okay, so the song isn't exactly metal, but if you appreciate guitars, you've gotta be impressed with this.  I guess there are guitars with more necks, but they aren't playable.  This is the first and only of it's kind and is now in the Guitar Hall of Fame.