PHOTOS: It's National Cheeseburger Day

Burger Wars Escalate As Restaurant Rolls Out 15-Pound Offering CLEARFIELD, PA - MAY 5: Rachel Fleagle (R) her sister, Jessica and Scott Staub, all of Philadelphia pose with the burger May 5, 2005 at Denny's Beer Barrell in Clearfield, Pennsylvania. The group was in the area and saw the burger on television and decided to make an attempt at eating it. The establishment features a 15 pound burger for $39 that is free if the customer can finish it. (Photo by Jeff Swensen/Getty Images) (Jeff Swensen/Getty Images)