E.T. the Extra-Terrestrial
This 1982 summer blockbuster blazed the modern-day trail for product placement, effectively putting Hershey's Reese's Pieces on the map. It was on-screen love at first sight between the film's namesake character and the little round candies – and movie-goers ate it up. Director Steven Spielberg actually courted the brand in exchange for promotion of his film, though his first choice was Mars' M&Ms, who turned down the offer. Despite the misstep, M&Ms were somehow able to soldier on – and movies would never be product placement-free again.