Boy’s Life magazine? Mutt and Jeff comic strip? Mulla Nasreddin? Esar’s Joke Dictionary?
Dear Quote Investigator: There is a brilliant comical allegory that depicts the biases inherent in many types of scientific research:
A police officer sees a drunken man intently searching the ground near a lamppost and asks him the goal of his quest. The inebriate replies that he is looking for his car keys, and the officer helps for a few minutes without success then he asks whether the man is certain that he dropped the keys near the lamppost.
“No,” is the reply, “I lost the keys somewhere across the street.” “Why look here?” asks the surprised and irritated officer. “The light is much better here,” the intoxicated man responds with aplomb.
Some scientific research is shaped by the need to perform replicable measurements. But these measurements do not always accurately reflect the phenomenon that is being investigated. The term “streetlight effect” is sometimes used to name this form of observational bias. Can you determine who crafted this clever story?
Quote Investigator: Trying to find the earliest instance of a tale is very difficult. But QI will make an effort and share the provisional results. On May 24, 1924 a Massachusetts newspaper printed an instance with a Boston setting. A police officer saw a man on his hands and knees “groping about” around midnight and asked him about his unusual behavior: 1
“I lost a $2 bill down on Atlantic avenue,” said the man.
“What’s that?” asked the puzzled officer. “You lost a $2 bill on Atlantic avenue? Then why are you hunting around here in Copley square?”
“Because,” said the man as he turned away and continued his hunt on his hands and knees, “the light’s better up here.”
Here are additional selected citations in chronological order.
Continue reading “Did You Lose the Keys Here?” “No, But the Light Is Much Better Here”
- 1924 May 24, Boston Herald, Whiting’s Column: Tammany Has Learned That This Is No Time for Political Bosses, Quote Page 2, Column 1, Boston, Massachusetts. (GenealogyBank) ↩