That one piece of media that shattered your long-held view on the medium as a whole.

When I was a kid, I got into Pokemon franchise through anime series. And while I was very big into Pokemon (and other "-mon" franchise like Digimon), one of the views that I had back then was "anyone should never made live-action Pokemon because it is the worst idea that anyone can think of." When I heard that they are going to make a live-action Pokemon movie with Ryan Reynold, I was already an adult and fairly apathetic to it.

That's until I watched the first trailer of Pokemon: Detective Pikachu and I got to the part where the photorealistic Pikachu with Ryan Reynolds. And that shattered my long-held belief since childhood that "live-action Pokemon should never exist." Not only that, when I actually watched the movie in theater, I never knew back then that I wanted a photo-realistic Bulbasaur and Squirtle more.