Party. Something told me to not eat them. Glad I listened; I mentioned it to another guy and he listened.

Seventeen people at work were sick for three days. The peanut butter had gone rancid; not quite sure of its age. His wife thought it was ok to use it up on the treats. They were spewing anything they ate from both ends for the next 72 hours. Fortunately it ran into the weekend and we only had one sparse day in the office. Nobody ever told the guy directly, but I helped them deduce what caused it.