After 50 long years, you promise not to tell?

A man works at a factory and every day he takes an empty wheelbarrow home after his shift. Each day he walks past a security gate, and each day the security guard standing guard suspiciously inspects the wheelbarrow and lets the man pass.

After 50 long years the guard finally asks the worker, "Look, I'm retiring today. I won't tell anyone, but what have you been stealing all these years?"

Looking over his shoulder the worker replied, "You promise not to say?"

"Yes, I promise." said the guard with a stern look on his face. "I have caught a man stealing a pen for his daughter's homework, a man hiding bread to take home to his hungry family, and even another one taking home water to wash his clothes. You, however, I could not catch. Either you are the most honest or the most ingenious man here."

With a grin on his face the worker looked up at the guard and said, "Okay, well I've been stealing wheelbarrows this whole time. I now have a whole business set up that I don't even need to work here anymore."