Upsidaisium
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Upsidaisium is a fictional element that appeared in the 1950s and 1960s Rocky and His Friends and The Bullwinkle Show animated series, in the story arc entitled Upsidaisium.
As revealed in the storyline, upsidaisium is a rare mineral that possesses antigravity properties; as a result, it is usually shown as hovering above the ground to varying degrees, and requires heavy weights to keep it rooted to the ground for storage. The source of upsidaisium is Mount Flatten, a mountain located in the American southwest that floats high above the ground (the mountain contains large deposits of upsidaisium).
In the story, Bullwinkle has inherited the mountain from a late uncle, and sets out with his friend Rocky the flying squirrel to claim the mountain and turn its upsidaisium over to the United States government, though their efforts meet hindrance from the series' villains, Boris Badenov and Natasha Fatale.
A follow-up storyline, Metal-Munching Mice, shows that upsidaisium in small amounts is capable of escaping Earth's gravitational pull and drifting off into outer space if left unchecked or uncontrolled.
Upsidasium was mentioned in an episode of the Winnie the Pooh television series. When trying to teach Tigger how to bounce again, Rabbit says that his uncle was from 'Upsidaisium' and his shoes had the ability to jump to enormous heights.
