Matthew McConaughey could have been a star. Okay, we're teasing about that. Matthew McConaughey obviously is a star. A HUGE star. But he could have been the leading man in the most iconic movie of the 1990s - and one of the most popular movies of all-time - if he'd just taken a tiny bit of advice during his audition and temporarily cut back on his thick Southern accent! Related: Margot Robbie Once Thought She'd Get ARRESTED After Audition With Leonardo DiCaprio?! According to the memoir of film producer Jon Landau, McConaughey was right on the cusp of booking the lead role of Jack Dawson in th...