Tony Gentile/ReutersIf there were a gold medal for stupid ideas, Olympic champion showjumper Eric Lamaze might now be standing atop the podium.According to legal filings submitted in Canadian civil court, in July, Lamaze sought to delay litigation over a disputed horse sale by claiming that he was suffering from metastatic brain cancer. But the plaintiffs’ attorneys didn’t believe him, alleging that he had made similar misrepresentations four years ago. When the court examined Lamaze’s supposed