Love the subject line, too. Keep me posted if this happens again. I don't now why it would have happened but will investigate if it continues or others report something similar.
In a similar line - one time I updated Windows and something happened to my fonts in email. Everytime I sent an email, the font was super tiny so I would increase the font size to make it look normal. Little did I know, the emails I was sending out were in GIANT letters! One day my friend replied, "What's with the big fonts?" I realized my gaff and then laughed like crazy because I had sent emails to my kids' doctor, my boss, etc. I had sent a "Congratulations" email to the doc because his wife had a baby. The next day the doctor's office sent a message saying the doctor would no longer accept personal emails and we could only send messages via their new contact form.
I think they thought I was a crazy stalker!