What's the absolute WORST thing you've written/received to the wrong window/number.

I've had some pretty bad experiences with wrong number/wrong window, where it's been out of context, completely random, inappropriate, and I'm sure other people have too. So, here's mine.

I was talking to a friend on Skype (text) and we were joking around for a while and then we decided to make plans for her to come over mine. I've always used a program to make the window I'm talking in the most "always on top", so I've had a few "Oh shit, wrong window" moments, but this was by far the worst.

I'd just moved so I typed in my address, hit enter and got up to shower. Came back about 20 minutes later to see I'd accidentally posted it in a chatroom I used to frequent, that usually had 100's of people, either idling or talking. I spent months worrying about people/things turning up at my house after that.