Next Window: Funny Blank Greeting Card

You hear that siren or see the flashing lights and you KNOW they're gonna pull you over for something (that you weren't paying much attention to, like speeding or running a red light). Wouldn't it be a hoot if you could post a sign in the window, as they walk over to ask for your driver's license, suggesting that they go to the next window?? What a hilarious, colorful way to send someone a fresh pie and police greeting!