I can't believe it.

I just had a conversation with someone for over 10 minutes on msn. Only after we had said good night and the other person signed off did I realise who I had spoken to. I really did think that I was talking to someone completely different. How could I be so stupid?? Especially as everytime he said something his name appeared next to it. That's a sure sign that I need to go to bed, I'm not thinking properly.....