Short jokes include one-liners, knock-knock jokes, question-answer jokes, funny quotations or any variation which contains adult-themed content such as political, satirical, sexist or taboo themes; some examples include: "What is red and invisible? No tomatoes," "Knock knock. Who's there? Aardvark! Aardvark who? Aardvark a hundred miles for one of your smiles!" and "Love is blind, but marriage is a real eye-opener." Short jokes for adults and people of all ages are available online from joke websites and mobile applications. Some feature jokes of the day or options to rate and share favorite jokes.
All types of short jokes for adults are funny to some, while offensive, corny or stupid to others. What makes a joke funny has been the subject of study for many years. Some of the elements of a funny joke, as observed by the Laugh Factory Report, are superiority over the joke's subject, a sudden realization of a misinterpreted concept, a humorous approach to sensitive topics such as marriage, stereotypes and morality and the fact that among animal jokes, ducks seem to be the funniest.
Other short adult jokes are called anti-jokes or jokes that are so bad they are funny. An example of an anti-joke is, "What is sticky and brown? A stick."