They call the city code regulation department and report the problem---then you have a visit from the official regulation guy. NOW---I totally understand trying to maintain the integrity of your neighborhood, BUT wouldn't it be nice if you stopped by your neighbor's home before calling the code police? There might be extenuating circumstances such as a new baby and a mother staying to help for a while.
Next thing you know the they might just pull up in your drive and yell,
"CITIZENS ARREST---CITIZENS ARREST!!!!"