A few day's ago I was sending a message to the girlfriend in which I was mentioning a flatmate. Somehow, I managed to send the message to my flatmate instead and not my girlfriend.
Message basically said "Come over tonight, the fat cow is out with her friends from work."
Obviously didn't go down well with her and I got a fairly rude reply from her saying she wants me out. Major cock up on my part, but it doesn't really matter as I was moving out anyway.

So, Has this ever happened to you? What was the message about and who was it meant for? Most importantly who did you send it to? What was their reply?
I assume it's happened to plenty of people out there, so, we should get a bit of a laugh out of this if all goes to plan.