In high school we had a day in our german class where we made crepes. Everyone brought in something like pie filling and other ingredients. During class, I opened up a can of cherry pie filling that someone had brought. We were playing cards and I ate 3-4 spoonfuls of the filling. I removed the lid all the way and licked it, only to discover it was pitted with rust. I scoop around the can and the entire thing was rusted on the inside, nothing visible from the outside. I distinctly remember saying out loud "Well that ain't good". It hit me about 4hrs later. I was eventually admitted to the hospital late that night due to severe dehydration from my near constant vomiting and diarrhea. I was 16 and so had to stay in pediatrics. My hospital room had cartoon ducks on the wallpaper.
Better still? The older sister of a girl I liked was my nurse. She was probably 22ish and hot as fuck. In the middle of the night I had to call her in because I shit the bed and was too weak to even sit up straight. I remember her and another female nurse assisting me to a wheelchair, changing my sheets, then helping me shower. It was humiliating as fuck.
I'm 46 now and that was the only time in my life I have ever been hospitalized.
A close second for me was a double cheeseburger from McDonalds. I ate it on the way to a Lords of Acid concert. I fucking knew something was fishy about it after 2-3 bites and didn't finish it. The cheese was a dark yellow and had hardened. After the concert, we had a 2hr drive home. I balled up on the backseat of my friends suv while he and his girlfriend drove me to my apartment. I have no idea how I managed to not throw up during the entire drive. It was hell on earth. We get to my apartment at 2am, I get out, they drive off as I stood there. As soon as they were out of sight, I dropped to my knees and did full body vomiting in the snow for about 10 minutes, then crawled about 50ft to my apartment door. I was about 23 with no health insurance, no family in the area, and just kind of tried to ride it out for a day or two. To this day, it was the sickest I have ver been in my life. It made the cherry pie filling incident seem like baby time frolicks in comparison. At one point during the 2 day illness, I was so weak that laid down on the floor of my apartment and stayed in that exact spot for about 4hrs even though my bed was 1 room away and I was 5ft from my couch. I thought I was going to fucking die. I absolutely should have been hospitalized.