Every moment is memorable.
1981: really set the stage for everything because Harry became an orphan and was subsequently left at the Dursley’s.
1991: for his other long time friend. McGonagall made it memorable “5 points to will be awarded to each of you for SHEER DUMB LUCK”
1992: Harry was ostracized for a power he wasn’t aware he had nor the significance of said power(cue brilliant Hermione explanation)
1993: the process begins to unravel the frame although no one gets it yet.
1994: as if anything right can happen today? Harry’s forced to compete against 7th years when it should be impossible. Again he is ostracized for someone else’s actions.