Forget MREs, invest in Bionic Burgers,

http://www.thebestdayever.com/burger.htm

He's not the only person who's done this. I read about another guy who left a deep fat fried McChicken sandwich in his co-worker's office as a joke and his co-worker didn't notice until over a year later and after the first guy had changed jobs. His friend thought he'd snuck back in to the building and hid it just recently. Pretty creepy.