We have a lot of personalized, "vanity" plates, here in Southern California. Many years ago, I was driving behind a youngish woman, and her personalized plate read:
0R 0H 0E
I pulled up beside her and, after motioning for her to roll down her window (no, I wasn't hitting on her), I said "You must be a baseball fan." She told me that I was the first one who ever figured it out, and that she was thinking about changing it, because it was too esoteric. We went our separate ways, and I never saw her or the car again*.
Michael
(*Yes, I know I blew it, but understand that I was, and am, married)