Respuesta :
The correct answer is an epigram. A device is a literary thing such as a metaphor or an oxymoron that is used to add some literary value to the work. A joke is a joke and is too wide of a category to be considered. A pun is a wordplay, so all puns are jokes but not all jokes are puns. An epigram is exactly what you described and they have been popular since the time of Ancient Rome.