Like a moment that seemed insignificant and unimportant at the time, but looking back was in fact a pivotal moment in pushing you towards radicalization.
For me probably being introduced to Guitar Hero at my friend's house in like summer 2007. At the time it was just another day, but looking back I ended up falling in love with those games, I ended up being introduced to The Ramones and even more importantly the Dead Kennedys through them, which caused me to get into punk music and resulted in me adopting very critical attitudes towards larger American society, attitudes which later grew into anarchism and then Marxism
I guess being really into FOSS and getting increasingly curious about the devs of Lemmy being Marxist, despite a lot of the FOSS community clutching their pearls over it. I read the manifesto just to see what it's about during vacation and after that everything just continued in the same direction and the world made much more sense