In 2004 McDonald's acknowledged that they had lost the recipe for the Big Mac special sauce. As it turns out, McDonald's changed the original special sauce recipe to cut costs and lost the original. When a returning exec wanted to return to the original special sauce, no one could find the recipe. The exec remembered the name of the California company that supplied the sauce 36 years ago. They still had the sauce in their record books, and McDonald's was able to recover the recipe. (Source: Newsvine.com)