Leonard Stern and his Tallfellow Prods. production shingle have acquired “Fortunately, I Was There,” a pitch from ad man Bob Lovka.Stern is hoping James Earl Jones will commit to star in the film, which Lovka will write for the screen. Jones is not attached to the project. “Fortunately, I Was There” is Tallfellow’s second project to get going. The first, Stern’s own “Pledge of Allegiance,” already is set up at Paramount by producer Mace Neufeld. The story centers on the world’s greatest amateur sleuth and his unique means of identifying and solving some of the world’s toughest cases. Stern founded Tallfellow as an “idea preserve” for writers and filmmakers after selling his majority interest in Mad Libs creators Price-Stern-Sloan Publishing last year.