A pun is a phrase or word that makes humour by relying on the different meanings of a word or words with similar sounds. A pun is often referred to as the lowest form of humour, and unlike jokes is often greeted with groans not laughter.
Examples of puns would be:
- Did you hear about the optometrist who fell into a lens grinder and made a spectacle of himself?
- There were two ocean tankers that collided. One was hauling red paint, one had blue paint. . At last report, the captains were marooned.
- Two peanuts walk into a bar. One was a salted.
No pun intended implies that a factual statement could be interpreted as a joke or pun, but that was not the intent:
Detective one: Looks like he was drowned in this vat of refrigerated blood at the slaughterhouse!
Detective two: Really? He was killed in cold blood? No pun intended!