Geekologie linked to a pretty amazing experiment: A woman bought a Happy Meal and kept it in her office for a year. After one year, it looks the same as the day she bought it:

My Happy Meal is one year old today and it looks pretty good. It NEVER smelled bad. The food did NOT decompose. It did NOT get moldy, at all.

This morning, I took it off my shelf to take a birthday photo.

Part of the photo of the year-old food is at left. If you ask me, this is a grosser (and more effective) experiment than Morgan Spurlock's Super-Size Me.