Bullet Train” is currently racing to the top of the box office, raking in nearly $13 million in receipts on opening night alone. Fans are already abuzz about director David Leitch scoring a few eye-popping celebrity cameos.[Warning: Major spoilers ahead.]Pitt, 58, stars as hired hitman Ladybug who boards a bullet train to retrieve a case and encounters several people along the journey trying to end his life.Lieitch’s colorful yet bloody crowdpleaser co-stars Bad Bunny, Joey King and Aaron Taylor-Johnson — but the filmmaker knew he needed some high-powered bonus attractions, too.“When you pay your money and you go to the theater, you want to have a fun time,” Leitch, 46, told Insider of his desire to score secret celeb scene-stealers.