He asks him, "What have you got that wheelbarrow there, sir?"
"Nothin'. Sawdust."
The operator finally begins to search through the piles night after night, but to no avail. He even brings out the plant security to check him, but nothing is found.
One night, the gaurd has had enough, and says, "Alright, Fred, enough is enough! What the hell are you takin' out of this damn plant!?"
"Wheelbarrows."

