Son of Flubber

'Son of Flubber' is a 1963 science-fiction comedy Disney film, and a sequel to the 1961 film 'The Absent-Minded Scientist', based on the 1922 short story A Situation of Gravity. Both films feature Ned Brainard, a professor who accidentally creates a bouncy rubber-like substance he names 'flubber'. Brainard creates the titular deviation of flubber, flubbergas, which is used at one point to fill up a football player's uniform during a game, leading him to bounce and float around before a tear sends him flying until he's deflated.