Loads really!
One that really does it for me is when we beat Wigan at Cardiff - first time I'd ever seen us beat them in a Challenge Cup Final (I was just too young for '66!) and had been through the agonies of all the ones since.
The thing that really still makes it the most special is the photo I took of our youngest daughter - then aged 8 - at the final whistle, and knowing that it was just as special for her too!!