The first time I had mussels, 1997. One of them tasted weird going down, all of them tasted awful coming back up.
Canadian Club whisky, many years ago.
Alcohol in general, more recently.
I’ll try not to drink those again.
I had a very bad encounter with screwdrivers and White Castle sliders. I’ve made my peace with virgin orange juice, but not screwdrivers or White Castle. The incident was over 30 years ago, FWIW.
Blueberry pancakes.
They didn’t make me sick, I don’t think – I got some kind of stomach bug the evening of a day when I’d had some in the morning – but I haven’t had one since, and that’s gotta be 15 years ago.
My stepdaughter gets queasy whenever we make turkey burgers. I don’t know if they actually made her ill one time, or if she ate them at a time when something else (like the flu) was making her puke, but she doesn’t even have to eat one now to make her nauseous - the smell of them cooking is enough to make her run from the room.
White chocolate. When I was 10 or 12, a couple months after Christmas I used my meager allowance to buy a wrinkled bag of small white chocolate holiday figurines from the reduced for quick sale bin at the supermarket. I scarffed them down and then enjoyed a possibly too vigorous constitutional on the monkey bars. Shortly thereafter the playground was colored with puddles of oily off-white sickly sweet acrid vomit.
For several ensuing weeks I could not eat anything, as in anything, that was white. Milk, mayonnaise, white bread, white meat, Monterey Jack, mashed potatoes, even vanilla ice cream, that heretofore infallible giver of succor - all of it made me gag. I gradually got over the general repulsion of white food. But white chocolate? To this day, no thank you.
Kashi Go-lean. Just a few days ago.
I didn’t vomit, but I exploded at the other end. I usually eat a bowl or two whenever I need to…soften things up. For some reason, this time it really aggravated my IBS. It caused me to have the fourth only episode of fecal incontinence I’ve ever had in my adulthood.
I was on the train, on the way home from work. I started having really bad stomach cramps and I thought it was just bad gas. I tried releasing some to see if it would make me feel better. When I released, I suddenly felt a warm gooey liquid cascading from my dairy-air. I was horrified. I was on the train with people. They started to notice. A few people got really grossed out and started gagging. It was awful. There was no bathroom for me to pitch my soiled clothes and undergarments. When I got off the train I had to walk another 15 minutes to get home. I was soooooooo embarrassed, OMG!
Lordy, Lordy 
Not me but my brother. When we were little, like 7 or 8, he ate a whole bunch of peanut butter toast, probably 4 or 5 pieces of it in a row. Enough that he said “If I even smell anymore peanut butter I’ll throw up” Naturally I put the peanut butter jar right in his face…and he threw up. He’s about 30 now and his wife tells me he’s just now able to be in the same room as it. For a long time if someone was eating peanut butter he was nowhere to be found. As soon as the jar came out, he’d leave the room and go fine something else to do for a while.
Can you have an allergy to turkey? I’ve often heard that people that act like that around certain foods, once they try it end up with an allergic reaction. All along, it was more then them not liking them smell, it was their body doing what it could to make sure they didn’t eat it.
Kimchi. I got home from work, having forgotten my lunch, and was so starving I descended upon the container of kimchi and ate way too much of it. It turns out a lot of kimchi on an empty stomach is a really bad idea.
That entire night and half of the next day were lost to the worst case of diarrhea I have ever experienced. I used to love kimchi, and now I can’t stand the taste of it. despite knowing it was the overindulgence that did it. Guess my brain didn’t get the memo. Hopefully in time the mental connection will fade and I’ll be able to eat that wonderful stuff again.
My first experience with mussels was similar - the first one tasted really awful (so bad that I spit it out and wiped my tongue off with my napkin). I’m probably lucky it tasted so bad - I didn’t eat any more mussels after that, and didn’t get sick. I’m still not a mussel fan.
I can’t think of anything. But when I was a small child…
I wasn’t feeling well, and I didn’t want to eat my tomato soup. My mom told me I will eat my tomato soup, and I’m not excused until I do. So I ate it… and promptly vomited all over the kitchen floor. It was probably a decade or more before I had tomato soup again. (I never swore it off when it happened; but I did avoid it.)
Also: When I was five, a doctor wanted to use a tongue depressor to examine my throat. I told him that if he did, I’d throw up. He laughed it off, my mom told me I was being silly, and the doctor soon had vomit in his trash can.
If a child warns you of impending vomit, believe him.
Juiced vegetables. I tried that a few years ago since I don’t get many vegetables in my diet. I mixed (I think) a cucumber, banana, kale, carrot together in a juicer and drank it. I noticed it smelled like wet cardboard but had never done it before so didn’t know what to think. What followed was 2 days of confused mania and (what I think was) severe hypoglycemia. I have never done it since. It wasn’t even food poisoning since there was no vomiting or diarrhea, I don’t know what happened.
Ironically I am able to eat vegetables. Vegetable smoothies in a blender have never made me sick. Vegetable powders are fine. Store bought vegetable juice is fine. I think the juicer was infected with pathogens (it was new and I’d never used it before). Last time I do that. I"ve heard kale and cucumbers can be toxic, I don’t know if that caused me to get sick or what.
That really must have been embarrassing, I’m sorry about that. That is one of my fears with public transit that I will have a strong urge to use the bathroom and not be able to find one.
When I was about 8 or 10 I got a stomach bug and hurled the Doritos and orange soda I had been eating. I haven’t had orange soda since, and it was about 10 years before I was able to look at Doritos the same way.
When I was about 16, I got a stomach bug and hurled the Kraft macaroni and cheese I had been eating. I have never eaten Kraft mac and cheese, or any boxed knockoff, since then. I never lost my taste for homemade mac and cheese though.
Cotton Candy. Ate too much at a carnival at about age 8 or 9, and no spun-sugar-on-a-stick has passed my lips since that day. Nor will it ever; I still hold my breath when I walk by the cotton candy booth at the fair.
Also that carb-cleaner-in-a-bottle known as Yukon Jack.
Injera
Another one I almost forgot, which is the most recent I can think of. When I was in college, I hurled after eating tomato soup and a grilled cheese sandwich. I tried tomato soup once since then, two or three years ago, and couldn’t eat more than one mouthful. I now have grilled cheese maybe once or twice a year after abstaining completely for five or ten years.
Chipotle - but because my dog ate some. After cleaning up the fourth pile of vomit, I knew I wasn’t going to be able to eat chipotle again.
Personally? Southern Comfort and canned ravioli, but thankfully not at the same time 
Looked the same coming out? 