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.
Red Bull. For several years when I was late teen / early 20s, I’d go clubbing all weekend… always drinking red bull, then inevitably overdo it with the disco biscuits and have to puke.
~4 years of that, and I’ve anti-Pavlov’d myself so that even the smell of red bull sets me heaving.