What perfectly normal thing can't you be around anymore due to something you experienced?
Mine is a pretty tame example: I never minded the smell of garlic was fine around it... but I took a job for DHL and they had these large tubs of garlic for horses that had to go out to people. There were about 10 of them coming down the belt.
Now I can't stand it. I'm just reminded of how strong that smell was I was actually gagging.
The tubs were heavy, the handles were feedble. Some of the tubs were damaged so I got a bit on me.
I stunk of it for the rest of the shift. It wasn't even a normal garlic smell it was just so powerful and nauseating.
My mom's favorite thing is cherries. I love my mom and I love cherries, but she ate so many that I can't stand the thought of eating fresh cherries. It's been maybe 20 years since I've had a fresh cherry and I expect it'll be many more until I can sit down with a bowl. Love cherries in dishes though.
I have the same experience, but with watermelons. During the summer my dad used to buy the biggest watermelon that he could find.
It was fine the first day but after that you get bored of the taste. When he saw that we've only eaten a quarter of the watermelon, he'd try to convince us to finish it. This was repeated a couple of summers and now I can't stand the taste of watermelons, even in gums or candies.
The taste isn't bad, it's sweet, but it tastes like to much work.
I make watermelon steak when I get tired of eating it raw. Its just grilled/pan-roasted watermelons that have been sliced into planks and rubbed with a marinade. The texture changes and feels a bit meaty & chewy, so its not watermelony at all.