The moment where you did something, even though it felt wrong to do, and it totally worked.
For me it was when I was texting a girl who I KNEW had a boyfriend. Relationships were sacred to me. Cheating was one of the worst things you could do.
"You wanna go for a ride with me?"
"I can't. I have to study."
"Shouldn't that be, 'I can't, I have a boyfriend.'?"
I was like "HA, ZING. GOT THAT BITCH." Then she texted back.
"I really want to see you."
Oh... Oh wow. It baffled me. This particular event is completely innocent compared to what I've done since then, but that was the moment that made me start devouring and practicing RP philosophy.