The First Cut isn’t the Deepest
Chaim Yankel, who traces his ancestry to the great men of Chelm, walks into a hardware store and asks for a chain saw that will cut six trees in one hour. The salesman recommends the top of the line model. Chaim Yankel is suitably impressed, and buys it.
The next day he brings it back and says, "This chainsaw is defective. It would only cut down one tree and it took ALL DAY LONG!"
The salesman takes the chain saw, starts it up to see what's wrong, and the Chaim Yankel says, "What's that noise?"