I'm familiar with pig iron, having done a lot of technical theatre in the past. In the fly gallery we used pig iron counterweights. They were heavy, heavier and heaviest. A guest director had driven everyone mad for weeks, so we created a pig made of styrofoam, painted it perfectly - brick red, complete with marks, scars and blotches of paint, and took to carrying it around, sweating as we did, waiting for the right moment. It came. In front of everybody director dude made some snide comment about how he'd done his share of lifting pigs, but was now beyond it. But he knew he could still lift them, etc. "Oh yeah? Here!" and the pig, lifted as if it weighed thirty pounds, was chucked at his, uh, front. He screamed and leapt aside like a girl seeing a mouse. The styrofoam pig bounced harmlessly beside him. Utter humiliation. Cast and crew fell to the floor, weeping with laughter. Moral: Don't piss off a techie.