I was in my local tractor sales/service place a while back. The line at the help counter was long and I was near the end. A gentleman was at the counter having a stressful discussion with the mechanic assigned to the counter that day.
The guys problem was that his "new" riding lawnmower was "scalping his lawn". He wanted to bring the tractor back and get his money refunded.
The mechanic was determined to discover a solution to the problem that did not involve bringing the tractor back to the shop.
After listening to the conversation for a while I realized that the mower was cutting the grass very short on one side and high on the other side causing the lawn to have a 'streaked' look.
The mechanic was thorough with his questions and analysis and the guy was becoming more and more persistent.
Suddenly it dawned on me what the problem was and I stepped out of line and approached the counter. I asked the guy to call his son (who I knew from hearing the discussion was home with the tractor) and ask his son a very simple question.
What was the question?
How did the guy get his tractor fixed?