LOS ANGELES - Actor Samuel L. Jackson left his mark on Hollywood Boulevard on Monday, sinking his hands and feet into wet cement in front of Grauman's Chinese Theatre, where many other stars have been honored. "It's an awesome sort of experience, the kind of thing you don't really think about as a young actor," Jackson said at the ceremony. "You sort of stop to pause and say to yourself, 'Wow, you're in a very elite club.'" Jackson began his film career in 1972 with "Together for Days," and has appeared in more than 100 movies, including "Do the Right...