If you're into autographed guitars and helping to fight hunger, you're in luck. The 27th Annual Hungerthon by WhyHunger is now underway, and up for auction this year are guitars signed by Johnny Cash, Willie Nelson, Def Leppard, Bon Jovi's Richie Sambora, Maroon 5, David Byrne, and Mumford & Sons, just to name a few.