Quad neck Guitar

http://uk.gizmodo.com/2008/04/21/worlds_first_quadruple_neck_gu.html

This is the Pro Electric Quadruple Neck Instrument With Guitar, Bass, Banjo and Mandolin Necks. Apart from needing another arm with 9 or 10 fingers attached, you’ll also have to have a neck made from granite to wield this monster on stage. And just how many spare strings will you need on any given night?