This used to be a fax machine "prank"/DoS-- put black construction paper into the hopper, then tape the out end to the in end as it emerges so it forms a "drum" of black paper that continuously feeds.
Fax that to someone and it ties up the phone line while wasting all the receiver's ink and paper.
Fax that to someone and it ties up the phone line while wasting all the receiver's ink and paper.