Utah’s David Whipple is the owner of what he calls “the world’s oldest hamburger” — a 20-year-old McDonald’s hamburger. The tale of David’s zombie-burger began at a McDonald’s restaurant in Logan, Utah on July 7, 1999. That’s when David bought his burger to use in presentations he was giving about enzymes and how things deteriorate. The 20-year burger experiment began accidentally. David said the burger was placed in a coat pocket. The coat was thrown in the back of his van, and he then hung the coat in a closet. Years later his wife was going to give the coat away and checked the pockets. Now, with its 20th birthday coming in July, the burger doesn’t look a day over 2 weeks and has a smell similar to that of cardboard.