I've never misdirected an email, but my dad has told me some VERY funny stories of his boss at work sending very important emails to the wrong people, and then hanging his head in shame when he found out! LOL!!!

I have, however, received a PM from someone here at PT before, that was meant for someone else. I couldn't stop laughing. My friends have IM'd me something that was meant for someone else several times, but it was nothing that would cause any problem.