Evidently the jinx is still a major belief in the realm of professional baseball. A construction worker working on the Yankee's new stadium buried a Boston Red Sox jersey in 2 feet of concrete in a service corridor. The Yankees plan to donate the jersey to charity, and may pursue a lawsuit against the construction worker. That seems a bit excessive for me, but I guess if you believe in curses, a jersey from your rival team might not be something you want buried in your stadium.
