On the day of his retirement an old sawmill worker pushed a wheel barrow full of sawdust out of the gate, past the Security Guard and headed for his truck.

The Security guard as usual told him to stop and let him check the sawdust and he proceeded to feel all through it.

He asked the old man, "You've been hiding something in this sawdust everyday for  25 years and I have never found it.  Would you please tell me what you've been stealing?"

The old man looked up and said, "Wheelbarrows".