Kevin Costner got his big starring break in Brian De Palma's The Untouchables, written by playwright David Mamet, whose own directorial debut came the same year. Sean Connery won an Oscar for playing sidekick and mentor to Costner's Eliot Ness. Andy Garcia makes one of his earliest screen appearances.
Speaking of which, Predator was released the same month! Now this is a movie. Arnold Schwarzenegger (aka former California governor) gets called in for a Central American jungle mission with his elite group of commandos that includes Carl Weathers (aka Apollo Creed), Jesse "The Body" Ventura (aka former Minnesota governor), and Lethal Weapon scribe Shane Black. Then they get eliminated one-by-one at the hands of a technologically advanced alien creature. Schwarzenegger faces him mano a mano in the finale. Classic!