Ironman swallowed some sheet-metal screws. He didn't pretend to do this. There is radiologic evidence. He had to wait on the med-surg unit for the screws to pass. This requires the poor nursing staff to inspect his fecal matter. I guess it can't be that bad, he's a superhero, they could probably sell it on Ebay. Finally, a nurse noticed large, coarse particles and began to celebrate. She might have even shouted "Eureka!", thinking her fecal screw inspecting days were over.
But, alas, it was only some pieces of wood and bark that he had swallowed some other time.