Defective Chainsaw

A man goes to the hardware store to purchase a new chain saw. The clerk sells him a very nice one, and tells him it can cut through a tree in less than a minute.

Early the next morning the customer is at the store, fuming mad, and exclaiming loudly, "This chainsaw isn't working at all like you promised. You claimed it would cut through a tree in a minute. I started yesterday at two in the afternoon and at dark was barely halfway through the tree!"

The clerk took the machine into the back, asking the man if perhaps he had done something to dull the blade, or perhaps the fuel mixture was not right. Cranking the chainsaw, the customer exploded, "What in the world is that loud noise!"