Cutting Trees

An idiot walks into a hardware store and asks for a saw that will cut 6 trees in one hour. The salesman recommends the top of the line chain saw model. The idiot is suitably impressed, and buys it.
The next day he brings it back and says, “This saw is defective. It would only cut down one tree and it took all the gosh-darned day!”
The salesman takes the chain saw, starts it up to see what’s wrong, and the idiot asks, “What’s that noise?”