My neighbors say they dont' give them anything but I thought this year I'd give them a PENCIL instead of candy and say something like "this is for your calculus homework".
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.
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