Fraggle Rock (1983)

Season 3: Episode 4

Gobo finds the legendary "Grapes of Generosity", mystical fruits which are rumored to compel anyone who eats them to share them with others. However, when Gobo brings them back, he ends up eating them and keeping them all to himself. Before long, Gobo becomes weightless, and tries to hide it from everyone else. But when he hears that Red climbed to the very top of the Great Hall, it's up to him to get Red down safely, and finally admit to everyone that his own problem was caused by being greedy.