I'm sure most of them will be about having kids/meeting SO/marrying SO 
I thought I'd start a nice positive thread for anyone who's feeling a bit down tonight, so what are your happiest memories? One of mine is a day down in Bournemouth a few years ago - I was a few months down the line from major surgery and I managed the whole day without having to sit/lay down somewhere, the first time since the surgery. The weather was beautiful and I just remember thinking "I'm getting better".
Anyone else?