Just as the witticism brings two very different real objects under one concept, the pun brings two different concepts, by the assistance of accident, under one word.
Graziak bi objektu erreal oso desberdin, ausaz baliatuz, hitz baten azpian ezartzen dituen bezala, horrela ezartzen ditu hitz-jokoak bi kontzeptu desberdin, ausaz baliatuz, hitz baten azpian: