Sarcasm is a form of speech or writing which is bitter or cutting, being intended to taunt its target.1 It is first recorded in English in The Shepheardes Calender in 1579:
Tom piper) An Ironicall [Sarcasmus], spoken in derision of these rude wits, whych make more account of a ryming rybaud, then of skill grounded vpon learning and iudgment.
It comes from the ancient Greek σαρκάζω (sarkazo) meaning 'to tear flesh' but the ancient Greek word for the rhetorical concept of taunting was instead χλευασμός (chleyasmόs). Sarcasm appears several times in the Old Testament, for example:
Lo, you see the man is mad; why then have you brought him to me? Do I lack madmen, that you have brought this fellow to play the madman in my presence?
Sarcasm is proverbially said to be the lowest form of wit.3 It is often associated with the use of irony. Hostile, critical comments may be expressed in an ironical way such as saying "don't work too hard" to a lazy worker. The use of irony introduces an element of humour which may make the criticism seem more polite and less aggressive but understanding the subtlety of this usage requires second-order interpretation of the speaker's intentions. This sophisticated understanding is lacking in people with brain damage, dementia or autism4 and this perception has been located by MRI in the right parahippocampal gyrus.56
