Billy Crystal is opening up about his final conversation with longtime friend Rob Reiner. The iconic actor appeared on Tuesday night's installment of The Late Show with Stephen Colbert, where he got candid about his late friend. After talking about his memorable Oscars In Memoriam tribute to Rob and Michele, who were tragically murdered in December, Billy revealed it was his idea to reunite cast members from the director's films. Fighting back tears, he explained: "It was shortly after the tragedy, and we had spent the night before together, talking about our careers together.