A farmer was plowing his field when his helpful but somewhat inept son comes 
to him.

"Dad, I would like to plow some."

"Well, I don't know son.  It takes a steady hand, OK, here take this and 
I'll watch you a while."

"Waite a minute son, your row is crooked as it can be."

"But I was watching the plow to make sure that I wouldn't."

"That's the problem, don't look at the plow,myou have to watch where you are 
going.  Look at the other end of the field, pick out one object and head 
straight for it and you will cut a straight row every time.  I'm going to 
get a drink of water, can you handle it now?"

"Sure dad."

When he came back out he saw taht his son had cut the worst row he had ever 
seen.  It went all over the field in curves and circles.  The farmer ran up 
to his son and stopped him.

"Son! What happened? I've never seen a worse looking field in my life.  
There is not one straight line."

"But, I did what you said, I fixed my sights on that dog playing on the 
other end of the field."