What was the top-grossing movie from 1978?

The answer is: Grease. In the shadow of Star Wars' dominance in 1977 (before they tacked on the episode titles, even), you'd imagine there would have been a rush of sci-fi sagas hitting the screen, along with an eager public shelling out cash for them.But instead, it was a musical about 30-year-old high school students racing cars and combing their hair that rocketed to the top, raking in nearly $160 million in the U.S. and Canada alone. That's electrifyin'. Source