I did. On a first date - what an idiot. I wanted to show her that I did this a lot and if she was going to get involved with me this was part of who I am. She could expect plenty of it. My previous girlfriend had absolutely no use for any guitar or singing stuff and got seriously annoyed when ever I played, so I wanted to be up front about it. However, the new girl told me later that this was when she decided she was going to marry me. Like thirty five years later.