Do you know the old wheelbarrow joke? It's truly funny only to grandpas and the grandkids they tell it to, so I won't bother with the elaborate setup. For years a factory worker pushes a wheelbarrow full of straw past a security guard on his way out. Suspicious that the guy is stealing something, the guard looks in the straw but can't find anything. Finally, when the worker is retiring, the guard asks, "I know you've been stealing something -- can you tell me what it is? The guy smiles and says, "Wheelbarrows." That joke keeps popping into my head...