He asks the employee for a good saw, I want to chop down 100 trees every day, he says.

The employee replies, 100 trees? You know what, you need a chainsaw. I will guarantee you can chop 100 trees with this one. If you can't do it, you can return it and you will get your money back.

So the guy believes the employee and buys the chainsaw.

The next day he returns to the hardware store to complain. I only got 50 trees today!! You lied to me!

No no, I didn't lie, says the employee. You should start earlier, like at 8 o'clock AM and work to 6 PM!

The guy goes back and the next day he starts at 8 and works with no breaks till 6. He returns to the store and shouts, this is impossible! I worked from 8 to 6. You lied to me, I only got 75.

I did not lie, says the store employee. You know what? Tomorrow I will come and help you, to show you it is definitely possible to get 100.

So the next day they go to the woods. The employee says, let me try. He starts the chainsaw.

The man steps back and says, what is that weird sound coming from the saw!!!