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Mega Monster Mountain was an amusement park at Hill Valley, California in 1991. The park had a bizarre theme, with all of its rides implying illness or injury, including the "Brain Basher", the "Gut Twister", the "Chow Hurler", and the "Spleen Splitter", a roller coaster. The park charged exorbitant prices, with $100 for an adult ticket, and $10 apiece for its official beverage, "Blue Brain Freeze Cola". Even with a discount coupon, Doc Brown had to pay $275 to take himself, his wife, and two sons to the park. As a result, Doc and Clara traveled to the 1904 World's Fair Exposition in St. Louis, Missouri, and arranged to return to a point two hours later to pick up their children.