See this Happy Meal right here? It’s a year old. Author Nonna Joann Bruso decided it’d be a great idea to buy a Happy Meal to observe what happened after a year. The answer? Well, that. Doesn’t look like it’s decomposed one bit. Wanna take a bite of that?
I worked at McDonald's when I was 16, and the bread does mold.
http://www.chinasmack.com/2010/pictures/chinese-netizen-mcdonalds-happy-meal-rotting-experiment.html
they did this in a movie called super size me(u probably have already seen it)