– Hey, I know you were asking for a hammer for your birthday. Here. It’s the top of the line. And because you’re so special, I didn’t want to just wrap it in an ordinary gift paper. Instead, I buried it somewhere in this terrarium along with ten funnel web spiders in it. Because I thought you’d like to have them, too. – Gee. Thanks. As Seth Godin puts it so eloquently, sunk costs are gifts from our past selves….