Do all idioms have a story or an origin where they came from? An example of what I mean is the origin of "mad as a hatter" provided by this site:
While “hatter” refers to Lewis Carroll’s Mad Hatter character in Alice in Wonderland, the expression has its origins in the effects of the chronic mercury poisoning commonly experienced by 18th and 19th century hat manufacturers owing to the use of mercurous nitrate in felt hats. “Mad as a March hare” comes from the behaviour of hares during the breeding season, when they run and leap about the fields.
and an example of what I mean as a story (turn a blind eye):
Interestingly, this expression is said to have arisen as a result of the famous English naval hero Admiral Horatio Nelson, who, during the Battle of Copenhagen in 1801, is alleged to have deliberately raised his telescope to his blind eye, thus ensuring that he would not see any signal from his superior giving him discretion to withdraw from the battle.