The rice thing is scary. My father works in the food industry, and he has told me some horror stories. Rice after three days is bad; it begins to smell funny and gives you a stomach ache. I generally will not eat rice that has been cooked over 24 hours ago, but thats me.
The bug you can get from rice is *much* worse. They actually use the term "explosive dirrhea" to describe the severity of the symptoms. Its a type of bug that makes you very sick and can cause you to dehydrate. It has something to do with the temperature of the food. You can get the same thing from prepared rice in a steamer at a buffet if it gets too cool as well.