Justin Long has been a busy man lately. That should be pretty evident by the fact that he had to movies to promote when he said down with MTV News' Josh Horowitz this week. The first, "A Case of You," a film co-written by Long and his brother Christian with Keir O'Donnell, tells the story of a man who molds himself to be the perfect match for the girl he's fallen in love with. The other is called "Best Man Down," a movie more serious than it's friendly title would have you believe. The day after his wedding, Scott (Long) finds...