Yes, there are many stories for me, but I shall relate this one.
When I was in my early 20s and living in London (around 2003). I was on the Tube, I think it was the Victoria Line. Anyway, I glanced at this absolutely gorgeous guy sitting near to where I was strap hanging. He got up and offered his seat to me, what a gent and we chatted. He said to me 'would you like to get off the Tube and have a drink with me?' which I did.
We ended up changing to the Piccadilly Line at Kings Cross St. Pancras, and we went to a place near Covent Garden. He said that as soon as he saw me he knew that he had to get to know me better. We ended up having a night out together, he was 29 and Italian-Irish, and the electricity between us crackled.
We ended up at his apartment near Earls Court. In the morning he gave me his mobile. and landline numbers and asked me to phone him the following day as he wanted us to meet up again.
When I got back to my own place in Islington, I thought long and hard about it and decided that one special time together was enough. I phoned him and told him that, he told me that as soon as he saw me he knew that I was 'the one' for him. We met on a fucking packed Tube train, it wasn't the most romantic place!
Anyway, I declined because I was playing (safely) the field. I do wonder what happened to him though. He was one lovely man. My DP thought I was terrible when I told him this story when we first got together. That was until I pointed out to him the fact that we would not be together had I started a relationship with this man.