COMMERCIAL IMAGE - Robin Williams, left, and Billy Crystal auction off a guitar autographed by Glenn Frey, of the Eagles, at the 12th Annual Starkey Hearing Foundation "So The World May Hear" Gala on Saturday, Aug. 4, 2012 in St. Paul, Minn. The foundation conducts dozens of hearing missions every year in the U.S. and around the world and has given the gift of hearing in more than 97 countries. (Photo by Diane Bondareff/Invision for Starkey Hearing Foundation/AP Images)

Associated Press
COMMERCIAL IMAGE - Robin Williams, left, and Billy Crystal auction off a guitar autographed by Glenn Frey, of the Eagles, at the 12th Annual Starkey Hearing Foundation "So The World May Hear" Gala on Saturday, Aug. 4, 2012 in St. Paul, Minn. The foundation conducts dozens of hearing missions every year in the U.S. and around the world and has given the gift of hearing in more than 97 countries. (Photo by Diane Bondareff/Invision for Starkey Hearing Foundation/AP Images)
COMMERCIAL IMAGE - Robin Williams, left, and Billy Crystal auction off a guitar autographed by Glenn Frey, of the Eagles, at the 12th Annual Starkey Hearing Foundation "So The World May Hear" Gala on Saturday, Aug. 4, 2012 in St. Paul, Minn. The foundation conducts dozens of hearing missions every year in the U.S. and around the world and has given the gift of hearing in more than 97 countries. (Photo by Diane Bondareff/Invision for Starkey Hearing Foundation/AP Images)