It's a great pity that nobody uses old fashioned fax machines these days.
With a fax modem and a suitable graphics program, one could send a "banner fax" - a fax with one enormous letter per page and no page breaks.
For sheer nuisance, a fax modem could be used to transmit a file of appropriate control characters that would render a roll of fax paper into a heap of paper spills only suitable for fire lighting.
Finally, with a fax machine sending to another fax machine, one could send a continuous "black fax" - a long strip of black paper was fed in and, when the leading edge emerged, it was taped to the trailing edge so it would be fed round and round continuously; with some fax machines, printing such a "document" would soon burn out the thermal printing head.

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