An Irish lumberjack goes shopping

He goes up to the clerk of the lumberjack store and asks for a saw. The clerk goes to the back of the store and returns with a large chainsaw. After payment is resolved, the clerk claims that the chainsaw will cut down over 20 trees everyday. The clerk and lumberjack share a laugh, and the lumberjack goes home.

A few days later the lumberjack is back at the store. He is obviously angry and has the chainsaw held in one hand. He plonks it down on the counter and complains "You claimed that this saw could cut down 20 trees a day. I could only cut down 5!" The clerk is flabbergasted, as this is an extremely expensive top of the line saw. He goes over the entire chainsaw, examining everything that he could take apart. At the end of the day he cannot come up with any faults. He tells the lumberjack to try it out again and come back the next day.

The lumberjack comes back the next day, with the same complaint. The clerk, now miserable from having to entertain the lumberjacks curses, finally decides to try one last thing. He grabs the saw and starts it. A loud "VROOM" is heard, and the lumberjack jumps up and shouts "What was that noise?!"

EDIT: Spelling