We all have those moments that we'll never forget and will stay with us forever. I've a few:
1) Breaking up with my on/off "boyfriend": We were together through final year, nothing serious just a bit of fun for both of us, but we stayed having fun when we finished college. I moved to the opposite end of the country and we kept the fun going. He wanted to just keep it as fun because of the distance, and that was fine with me. Then he dropped the bombshell that he had a girlfriend. Who was living in America. So I stopped contact. Over Christmas I was back up at home and he called and asked if we could meet for coffee as friends, I agreed, cos before we were having fun we were friends and I missed him, but one thing led to another and yeah, well I don't need to say what happened

I felt awful for his girlfriend, but I got over it. We met for a drink again, and he kept trying to lob the gob, but I just kept avoiding it. We were walking through town and he took my hand, looked into my eyes and told me how much he loves spending time with me and how much he misses me, and went to kiss me. I muttered "you have a girlfriend" and that stopped him. We talked for a while, and then had a goodbye kiss - and I have to say, that kiss will stick with me FOREVER. It was so emotional - so many feelings behind it. It was perfect - just the best kiss ever, knee's buckling, the lot! - until I remembered it was a goodbye kiss, and I had to go. I cried the whole way home in the taxi. I'll never forget that kiss. I still get butterflies when I think of it.
2) Holding my nephew for the first time: And looking into his eyes and thinking that he was the most precious thing ever. Knowing that this little dude was going to be a major part in my life (his mom had PND so I was minding him for the first few months) and knowing that I was unconditionally in love with this 6 hour old lump. He signalled a turning point in my life - it wasn't on track, but knowing he was going to rely on me made me get things back on the straight and narrow, and now he has an aunt he can be proud of. I love that kid, and some day I'll have my own and give him some cousins.
3) Hearing my first serious boyfriend had died: His sister rang me to tell me he'd had a brain hemmorage and was in ICU. We'd been together for almost 5 years and had broken up over the summer, but were back talking and had spent the previous weekend together (yes, in the biblical sense!) and were discussing if we could move on from our break up (we broke up because I'd lost his baby) and we decided that we should give it another go. He had the stroke on the Tuesday and died on the Thursday. I got a phonecall on my way home from work to tell me he was gone. I never got to say goodbye. The weekend together we'd spent listening to Snow Patrol's "Final Straw" albumn, and "Run" was on my ipod as I took the call - that song always reminds me of him.
That's all I can think of for now! I'm sure as others share I'll remember more!