I was maybe 10 years old, and on vacation with my family. We had gone to a restaurant for lunch that was supposedly locally famous, and I ordered a fried fish sandwich. It came, and as I took my first bite I told my mom that it tasted funny. She scolded me for being picky, and told me to eat it. So I did.
Two hours later, we're doing some tourist stuff and I'm not feeling well at all. Again I complained, and my mom took me to the car to wait for everyone else. When they got back, they decided we needed to make one more stop on the way back. I was assured it would be quick. Mom and I waited in the car as I was feeling much worse.
After we finally started to head back to the hotel, my dad was taking a winding road with lots of small hills, and he was going fast enough that the car was bouncing and such. I asked him to slow down because I wasn't feeling well, and immediately threw up all over my mom.
What followed was almost a week of the worst sickness I've ever had. Various fluids were coming out of both ends, and when there were no fluids left my body was still trying to purge with dry heaves. It was awful.
I'm 32 now, and I haven't had a fried fish sandwich since. It's the strangest thing, because I'm fine with like fish sticks or just a piece of fried fish, but if you put it on a bun I can't bring myself to eat it.