I love it. I don't think you should do anything more expensive than a pencil, although I'd be fine saying "Sorry, after puberty and no costume, go away."
I hate this too, although admittedly it hasn't been much of a problem where we live.
A paper clip truly says, please don't come back next Halloween!
__________________
~ *~"ADPi"~*~
♥Proud to be a Macon Magnolia ♥
"He who is not busy being born is busy dying." Bob Dylan