Parking skills
This is classic passive-aggressive behavior, while obviously what they’re trying to say is – learn how to park! There must be something better we can do about these people who don’t know how to park, or just won’t learn, because leaving these signs, as funny as it is, doesn’t seem to be of too much help.
I’m sure the person received the message, and perhaps it made him feel guilty for a second, but next time he’ll go on parking as he always does, because some people simply don’t seem to care. Still, leaving these notes can’t hurt, and perhaps it’s a way of venting some that very justified anger.