One-line joke
A one-liner is a joke that is delivered in a single line. A good one-liner is said to be pithy. Comedians and actors use this comedic method as part of their act, e.g. Jimmy Carr, Tommy Cooper, Rodney Dangerfield, Ken Dodd, Stewart Francis, Zach Galifianakis, Mitch Hedberg, Anthony Jeselnik, Milton Jones, Shappi Khorsandi, Jay London, Mark Linn-Baker, Demetri Martin, Groucho Marx, Dan Mintz, Emo Philips, Tim Vine, Steven Wright, Henny Youngman, etc. Many fictional characters are also known to deliver one-liners, including James Bond, who usually includes short and witty quips after disposing of a villain.
Examples
"A baby seal walks into a club."
"A dyslexic man walks into a bra." (Anonymous)
"Venison's dear, isn't it?" (Jimmy Carr)
"Race is just a pigment of the imagination." (Glen Highland)
"What Iran needs now is a more modern leader - a mullah lite." (Shappi Khorsandi)
"I have nothing to declare except my genius." (Oscar Wilde, upon arriving at US customs, 1882)
"Take my wife ... please." (Henny Youngman)