two that I can think of

when my FIL said something so batshit insane I realised that moment he and the rest of the fam were in a cult

and then much later doing CBT when my doc showed me that the people i thought cared for me had never done a nice or kind or supportive thing ever ( I am lucky I am past that , I have the seagoons now 😊 )

If I hadn't realised sea rocks are really nice to look at and can prop up a clothesline and a birdbath I'd have more of them.

If I hadn't decided to tell my house mate the truth about my drug use, he never would have told me he believed in me, which was the catalyst to getting where I am now.

If I hadn't have made the decision to go against my ex, and go get beers with my coworkers, I would never have left them at all. My one small rebellion against his insecurities and desire to control everything I do, led me to breaking up with them that very night (late October 2018).