I can picture Holmes and Watson in a cab driving from one mystery to another and Watson being puzzled at a stop light by the license plate of the car in front of them.
But then Holmes says "Elementary, my dear such and such . . ." and he tells Watson what the license plate means.
That probably happens all the time, but you don't see it in any of their stories because deciphering personalize license plates isn't much of a super power. As far as super powers go.
Sometimes it sure would be nice though.
Like right now.
What the hell does RDMRMNT mean?
Personalized license plates . . . eh.