Don Gorske claims to have every receipt for each Big Mac dating back to 1972. He probably has every cat he owned too. It's all documented in Gorske's book: Big Mac Memories.
Implications - All health concerns aside, Gorske promised himself he would eat a Big Mac every day no matter how bad his health was looking. It became everything he looked forward to in his day, and though this may be sad for many, the public shouldn't discourage him from indulging in his greatest pleasure.