I did.
http://everist.org/valentine/20180214-valentine-dumbarse.txt
I didn't do it on Valentines day, but some 10 years ago I met this awesome chick out at dinner with a group of completely unrelated people (one of those expat things you do when living alone overseas), we hit it off and had a brilliant night. At the end of the night I said goodbye and got in my Taxi. About 30 seconds down the road I had that "Oh shit, I didn't get her number". I also had no way of getting her number or contact details. Pretty bummed I went home to bed.
Next day at work I was chatting to one of the blokes (it was his 40th birthday) about this awesome bird I'd met last night, how great we got on and how much I completely blew it. We all knocked off early and went to the pub to celebrate his birthday. About 8 pints of Guinness later I looked up and there she was sitting at a table in the corner with a group of old business men (turned out to be her dad and some of his colleagues). Being slightly inebriated I wondered how to approach this when she got up and walked into the pub to use the loo. Seeing as there was only one entry/exit I went and propped my self up at the end of the bar and waited for her to walk past. Suave as you like I said "Hi, we met last night and I forgot to get your number. I'm drunk right now and have nothing to write on, so please take my business card and send me a message tomorrow so I can call you". Turns out she was about halfway into a bottle of Tequila at that point, so in her hungover state the next morning she fishes that card out of her wallet and wonders who it was from. Later in the day she remembers, so sends me an SMS. I gave her a call and we've been together ever since.