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Dad used his axe to cut wood for a living...maybe two cords a day.
In the mid-1960’s, a salesman came up to him and said, “You use this here new gadget called the chainsaw, and you’ll double your output to 4 cords a day!”
Dad didn’t like all the new-fangled stuff...but to be polite, he said he’d try it for a week. If he was able to cut 4 cords, he’d keep the chainsaw.
First day, he could only get 2 cords, but he improved each day so that by the end of the week he had made it up to 3 1/2 cords each day.
When the salesman returned, Dad gave it back, saying he could only cut 3 1/2 cords trying his hardest.
The salesman looked stymied and said that there must be something wrong with the chainsaw. He checked the gas and the oil and the chain. They looked good. He pulled the cord and started it up with a loud brraappp!
Dad yelled in surprise, “WHAT”S THAT NOISE?”