Polite Notice

Why are the British so polite? In public places and car parks everywhere, signs like:

Please don't park

DO NOT work and should just be trimmed to:

DON'T PARK

In the places allocated for the disabled, there may possibly be some sort of effect on those who are absolutely selfish and don't care:

"You've got my parking space. Do you want my disability too?"

  Even this shouldn't be so weakly worded. Perhaps:

You and your vehicle

are forever cursed

DA