Mine isn't nearly as good (awful?) as crossing out the wrong date and writing the right one in, but I did get a rejection where the director signed off with:
"peace, Program Director's Name, Ph.D."
I felt like I had just rejected by the lead singer in my little brother's garage band in response to my request to sit on bass while I was home for spring break.
It also had an ambiguous title with regard to acceptance/denial, and the only thing that was visible on the preview mode of my e-mail was something like, "Dear Space Owl, Hello! We have recently..." and I don't know about you, but when I see an exclamation point after a Hello, I assume good news is to follow. Way to not set a somber tone!
All and all, though, I kind of felt like Will Ferrell in Anchorman when he says, "What? You pooped in the refrigerator? And you ate the whole... wheel of cheese? How'd you do that? Heck, I'm not even mad; that's amazing!" 'Cause whatever else they may be, these are some amazing rejections.