Literally dozens, but first great one was getting to top of the Zinal Rothorn in 1967. Others: when my twin brother and I both led Cenotaph Corner on sight at separate times on the same day in 1970 (a big pub celebration that night!); getting back to the road alive (just!) after 3-day epic on Store Trolltind in Norway in 1969; arriving at the cave on Vector in 1983; getting to the tree at the top of Debauchery after onsight lead in 1995; taking all my medium format camera gear to the summit of Kala Pattar on a very cold night with a full moon to get shots of sunrise on Everest in 1999; returning to Store Trolltind with John in July 2013, climbing to the summit, and thereby 'completing' the Fiva Route 44 years and 4 days after our 1969 epic - quite a moving farewell to the mountains, because my damaged eyesight means I can no longer see my feet well enough to place them accurately. So what? I have no regrets at all; have had a great time.