Reason infinity why it's great when celebrities join Twitter. M. Night Shyamalan, the man behind 'The Sixth Sense,' 'Signs' and -- unfortunately for him -- 'The Happening' and 'The Last Airbender,' has recently signed up for the social networking site, and in a tweet late Wednesday night he revealed what Hollywood superstar Will Smith has taken to calling him. Responding to a fan wondering what friends call Shyamalan, the director wrote, "Most family calls me 'Manoj.' All my friends and everyone else calls me 'Night.' A few peeps call me 'M.' Will Smith calls me 'M. Neezie.'" And there's your icebreaker, should you ever run into Shyamalan on the street!