Time Machine In Shop
I just ran across your webpage and it was so funny I had to submit this one I found. I'm a developer myself and can understand how some placeholder error messages are accidently left in. I found this error in Eudora - both Lite and Pro. I imagine it was intentional, though.

"I know you had to send this message yesterday, but I just can't do it until my time machine gets back from the shop."
To duplicate this, create a new message, save it and then queue it to be sent for a date earlier than the current one.
Submitted by: Steve Currie
Hey, you have to love this one …and it even makes perfect sense. Definitely not an error!