I saw a plate one time that read RETRD. I was laughing so hard...I immediately thought retard. Then someone told me it was probably retired. I still think it looks more like retard.
I’ll never forget a license plate that I saw when I was a kid. It was an old beat to hell Sanford & Son type pick up with a plate that said: JCK SHT and a bumper sticker that actually said JACK ****.