I hadn't eaten fish much as a kid so hadn't really developed disgust towards it. My parents only gave us fish & chips which I found 100% gross because I hated anything deep fried. During that period I would sometimes eat sushi and smoked salmon. I thought of fish being wild and free in the sea, you know
But I had two colleagues who were vegan. They never said anything to me about eating vegan, but shortly after I met them, I suddenly couldn't eat fish any more. It was just like before, I was disgusted by it. I never ate any meat after that
(I was working in a health food shop)