Boom! Mark Zuckerberg was served legal papers relating to a mysterious lawsuit at a fancy lunch in Sun Valley, Idaho yesterday. The sneaky server pretended to ask for Mark Zuckerberg's autograph before dropping the bomb.

According to the New York Post, Zuckerberg was carousing with business and media elite at the yearly Allen & Co. gathering when,

someone breached the tight security guarding the duck pond lunch spot to deliver the legal papers. The person approached Zuckerberg's table, where he and COO Sheryl Sandberg sat relaxing, and pretended to ask for an autograph before delivering the requisite phrase, "You've been served."

The Post does not know why Zuck is being sued, but suggests it could be privacy related. Any hints? Email us.