Once, when I was on Yahoo IM, I was talking to GD and somewhere through the conversation CP stepped in to the conversation and I didn't see that she had said it was her. So the whole time I thought I was talking to Greg, when it was in fact, Jenn.

It could have been embarassing, but it wasn't.
I figured it out when she said, "Greg thought the same thing." Or something to that effect. Then I'm like, "Am I not talking to Greg?" She said no.
Thank goodness we weren't talking smack about her or we both could have gotten smacked later. Just kidding.
ETA:
That gave me the idea for one of the Open Mic pieces I wrote.
