Wit is a form of intelligent humour—the ability to say or write things that are clever and typically funny. Someone witty, also known as a wit, is a person skilled at wit, making spontaneous one-line
"The feast of reason..." — James Gillray (1797)
Sarcasm is the caustic use of words, often in a humorous way, to mock someone or something. Sarcasm may employ ambivalence, and is also commonly associated with, though it does not necessarily contain
Wit
…cruel (as also in many epigrams), and perhaps more ingenious than funny. A quip is an observation or saying that has some wit but perhaps descends into sarcasm, or otherwise is short of a point. A witticism also suggests the diminutive. Repartee is the wit of the quick answer and capping comment: the snappy…
Use of sarcasm in an ad sticker of a boxing studio. The message is negative and directly mocks, or even jokingly insults, the person targeted by the advertisement.
A sarcastic response written on a table that reads "Wow, you are SO deep!"
Sarcastic comment below a memorial plaque for Alois Alzheimer who first described Alzheimer's disease. The German text means "Alois, we will never forget you!", subtly playing with the contradiction between a disease deteriorating the human memory, the purpose of the memorial and the added text.