Oh my gosh yes. Few years ago I sent my boss an instant message that was intended for a co-worker. Luckily it wasn't too vulgar, it was just silly. I had to explain it wasn't intended for her. Bit embarrassing, but could have been worse.
Edit: Looks like I wasn't fast enough, ha. Unfortunately I haven't been awake all weekend having sex. Would be wonderful to do though.
Have you ever wanted to learn how to fly a plane?