"Chainsaw" joke

This (Blonde) fellow is looking to buy a saw to cut down some
trees in his backyard. He goes to a chainsaw shop and asks 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."
So, the man takes the chainsaw home and begins working 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 man tells himself.
So, the next morning the man gets up at 4 am in the morning and
cuts and cuts, and cuts till 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 one hundred cords of wood in a day, no problem. I will
take this saw back to the dealer," the man says to himself.
The very next 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?