A farmer walks into a hardware store and asks for a chainsaw that can cut down six trees in just one hour.
The salesman recommends a top of the line model and the farmer is suitably impressed, so buys it.
The next day he brings it back, complaining that it would only cut down one tree and it took all day!
The salesman takes the chain saw, starts it up to see what’s wrong, and the farmer says: “What’s that noise?”