I can’t disagree with any of these suggestions however a more recent one that was the trigger for its current position is Kevin Phillips pen vs Watford and the subsequent block off the line (I cant remember who)

The first promotion to the top league winning 3-2 in a come-back v Fulham was my first real high with Palace.
The 5-0 defeat of Manchester United at Selhurst, with Don Rogers truly World-class that day.
Burnley with the team that would be renamed "The Team of the Eighties".
The Stockport survival game with Dougie's late winner.
The Sheffield Wednesday televised survival game. I wasn't at the latter two.
The Cardiff play-off win versus West Ham with their "Moore than just a football team" training shirts and a Neil Shipperley poacher's goal. Leading at Wembley with only moments remaining. Puncheon's Cup Final goal when I thought: this time we'll show the World. As much pain as joy here, but I love Palace!

I was fortunate enough to be there one of the best nights . Midweek game and palace had four special trains that night with untold coaches . Fantastic support

Nicola Ventola putting us 2-1 up at home to Southampton and what seemed the entire ground singing his name to Verdi's La Donna e Mobile on the spur of the moment while the rest of the team mobbed him. then Higginbottom equalised which has already been noted on the 'worst moment' thread