If you're one of those brave people that leave your bowl out for trick-or-treaters to get their own candy without ringing your doorbell first, then you might as well put a cute sign with it. So here you go, a free 8x10" printable trick-or-treater sign:
Hopefully since the sign says "please" AND "thank you" it will be a deterrent for those obnoxious teenagers who always clean out the unsupervised candy bowls.