Leftover Vanity Plates Of The Month

On a Mercedes Benz:  JONES 11.  Guess that's how you keep up with the Joneses one through ten.

Another Benz with T BENZY.  Once again, we all know what you bought, no need to remind us.

ROKACHT.  Perhaps just the guy's name.  Or is it some heavy metal rock act?

SISYFUS.  Hate to be stuck on a hill behind this guy.