Q.E.D. is sometimes jokingly claimed to abbreviate "quite easily done". Q.E.D. can also be used to ridicule the specious reasoning of another person by mockingly attaching it to the end of a poor argument, which was not in fact successfully demonstrated or presented.
Printed copy · Anthology Volume 1, page 211Printed copy from The Tender For Law Anthology, Volume 1, page 211 (printed 14 June 2014). Added by this site; not part of the Facebook export.