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Grease was a popular movie on Earth. Dr. Rodney McKay regretted not seeing this movie when he believed he would die because he had a crush on Olivia Newton-John. (SGA: "Letters from Pegasus")
When Eli Wallace asked his mother Marian Wallace what her favorite movie was, she first replied Grease and The Sound of Music but Eli believed it was E.T. the Extra-Terrestrial. (SGU: "Pathogen")