Personalized plates are just another way of others knowing it's your car...not so much of an issue unless you are like me and trying to a.avoid the police as much as possible and/or b.don't want everyone who knows you to know where you are all the damn time.

that being said here are a few plates I have seen lately
Mufdivr (friend of mine is on underwater s&r with me)
Luv2Ram (purple dodge ram I saw on my way to work)
3at m3 (in your mirror it says eat me)
WTFOVR (I was in nebraska and it was some big pickup)
sucess2 (on a mercury topaz which I found kind of strange)
Schnell (german for fast on an M coupe I used to race with)