An Iowan walks into a hardware store and asks to see the chain saws.  Picking
up one, he asked the store clerk, "How many trees will this one cut in an hour?"

"Oh, that one will cut about five good sized trees in an hour," replied the
clerk.

"What about this one?" asked the Iowan.

The clerk replied, "That's an intermediate model which cuts around ten trees."

"And this one?" asked the Iowan.

"That's our best model.  It should cut at least 20 trees in an hour," said
the clerk

"I'll take it!" said the Iowan.

Two days later, the Iowan returns to the store and angrily states, "Hey, this
saw is terrible.  I could only cut three trees in one hour with it!"

The clerk says, "Gee, I don't understand that.  This is the best chainsaw we
carry.  Wait a minute while I check it out."

The clerk pulled on the starter rope and the saw immediately activated with
a loud roar.

'Hey," said the Iowan, "what's that noise?"