Halloween Postcard with MIRROR WRITING

I found this Halloween postcard amongst about 3,000 others that I bought at auction a few months ago. Unlike the majority of postcards where the picture on the front is the focus, it's this message that had me intrigued and puzzled for about 2 hours before a friend suggested I hold it to a mirror and then read it. Sure enough, the writer of this card (1912) wrote the ENTIRE message in MIRROR-WRITING ! And he did it very well too as it looks like it's his normal handwriting. Actually, I did a bit of research and found that he COULD have dyslexia. Very funny and spooky message too!