Uh, thanks?
Celtic Cross, in case you don't know (and I hope you don't), "Don't let the door hit you on the way out" or its variants is actually a common phrase used to indicate that you're not sorry to see somebody leave - it's a way of telling them to get lost, really. I do hope that isn't what you intended, but it is how I read it to begin with, and I think how Bear did as well.
This explains that useage - it may be more common some places than others.