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Re:Why I prefer making useless stuff by valbaca on Sunday May 23, 2021 @04:11PM (#27258126)
Or use the trick from Java Puzzlers (which may have borrowed it from another source):

Feel free to mail us your feedback written in pencil on a $20 bill.

Re:Why I prefer making useless stuff by scottlamb on Sunday May 23, 2021 @05:26PM (#27258735)
> which may have borrowed it from another source

Probably Car Talk. Iirc they instructed that puzzler answers be written on the back of a $20 bill also. It was a great radio show!