Indian With A Chainsaw

An Indian who just came from India 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 Indian. The clerk
replied, 
"That's an intermediate model which cuts around ten trees." 
"And this one?" asked the Indian. 
"That's our best model. It should cut at least 20 trees in an
hour," said the clerk 
"I'll take it!" said the Indian. Two days later, the Indian 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 Indian, "what's that noise?"