If you scratch my back, I'll scratch your back. Handymen and tradesmen have been living by this law for centuries and it's arguably one of the few industries left that follows the old-school, handshake contract traditions. Through the uncommunicated secret bond of fellow tradesmen, most blue-collar guys would go out of their way to help a guy out with their project, simply because they know that the good karma will come back to them at some point.