While I was stationed in Korea with the Army, I found out that I was violently allergic to aspartame. After a company party, I was on the clean-up detail and policed up a left-over case of diet Pepsi. I took it back to my quarters and drank the whole case over the weekend. By Monday, I had severe stomach cramps and extreme diarrhea.
I could stand at one end of the latrine, bend over, and hit the toilet 20 feet away ...