A fellow is looking to buy a saw to cut down some trees in his backyard. He goes to a chainsaw shop and inquires about various chainsaws.

The dealer tells him, "Look, I have a lot of models, but why don't you save yourself a lot of time and aggravation and get the top-of-the-line model. This chainsaw will cut a hundred cords of wood for you in one day."

The man buys the chainsaw, takes it home, and begins to work on the trees. After cutting for several hours and only cutting two cords, he decides to quit. He thinks there is something wrong with the chainsaw.

"How can I cut for hours and only cut two cords?" the man asks himself. "I will begin first thing in the morning and cut all day."

The following morning, the man gets up at 4 a.m. and cuts and cuts and cuts until nightfall, and still he only manages to cut five cords.

The man is convinced this is a bad saw. "The dealer told me it would cut 100 cords of wood in a day, no problem. I will take this saw back to the dealer."

The following day, the man brings the saw back to the dealer and explains the problem. The dealer, baffled by the man's claim, removes the chainsaw from the case.

The dealer says, "Hmm, it looks fine."

Then the dealer starts the chainsaw, to which the man responds, "What's that noise?"