Minions

'Minions' is a 2015 animated comedy film, and the third entry in the Despicable Me franchise. Set in the 1960s, the movie is prequel and an origin to the Minions, small yellow creatures who serve under those who are bad, and how three of their number go off to find big time supervillains Scarlett and Herb Overkill as masters.

Concept art of Herb Overkill and his inventions show one such invention that never made it into the film, legwear that seemingly inflates into a large bouncy yellow ball, as demonstrated by Herb.