A man who is a known thief manages to get job at a construction site. The security guards, so every day at quitting, he comes trundling along with a load of rubbish in his wheelbarrow, the main security guard checks for any valuable items, but he always finds nothing. This went on for some time until the job ends. Years later, the security guard was retired, and he ran into the thief. "OK, I know you were stealing something, but I'm retired, and it's probably past the statute of limitations anyway." The thief smiles and nods. "Oh, yeah, yeah, I was stealing something from the site." The security guard nods. "OK, we watched you like a hawk, only time you were out of site was to use the toilets, and we checked there too, just what were you stealing?"
The thief shrugs and smiles.
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"Wheelbarrows."