Yes, quite a few come to mind.
- first solo, first XC, etc;
- the "buzz" each time the examiner says "You passed";
- the joy at taking a friend for a jolly round the estuary. This friend was 60, and had never dared fly in anything all his life. He was a very keen sailor, so I flew round the yacht race that he used to compete in. He loved it: he and his wife now fly regularly on holiday;
- but most of all: flying from Brackett out across the desert, along the Grand Canyon, and landing at GC. Wonderful! Must do it again...