Carl Icahn, the 77-year-old billionaire investor, has an idea for Apple. It’s an idea he believes so strongly in that he’s bought 4.7 million shares in the company—a stake worth more than $2.5 billion. And he’s using every tool at his disposal to get Apple to use his idea, from social media to dinner dates to his latest move, a formal shareholder resolution. The only problem is the idea stinks.