There was this chap I used to know called Greg, a friend of friends. I could never speak to him because I always had this compulsion to call him Ray. I knew that Ray wasn't his name but it was the first and only name that came to mind whenever I came across him. I have absolutely no idea why. Not that it was ever a problem because he was a bit of knob to be honest.
Anyways, it reminds me of the opening line to It's a Shame About Ray - "I've never been too good with names"