Did you hear about the man that decided to buy a chainsaw? A logging foreman sold him a used one that he guaranteed would cut down 100 trees in a single day. A week later, a very unhappy man came back to report that the saw must be faulty because he could only cut down 8 trees per day.
The logger looked at the carburetor. He checked the gas and the spark plug. He commented that he couldn’t find anything wrong. He then grabbed the saw, pulled on the starter cord, and the chain saw promptly went “BZZZZZZZZZZ.” The man who had bought the saw jumped and cried out, “What’s that noise!”