2. Pig Feces
Unsurprisingly, perhaps, it turns out that consuming animal feces can make you very, very sick. Take, for example, a 2006 case where more than two hundred people became incredibly ill after consuming spinach later shown to be covered with E.coli caused by exposure to wild pig waste.
Take this as a lesson—never, ever consume your produce without washing it first. To reduce time, use a salad spinner for items like spinach and lettuce.