I had a student...Natasha, who spent lots of time making a huge one. I always kept a bag of rubber bands in my classroom for experiments. She asked for a few and ended up using the whole bag.
Goodness, gracious, great balls of sorbo rubber - or something very much like it. The balls are decorated with beautiful Arabic script with various offensive messages and awful execrations, horribly denigrating to Christians, Hindus and Feminists, and also to the hero Charles Martel, of whom I happen to be a descendant through his illustrious grandson (and some say, who isn't?). I saw one of these bouncy monstrosities offered on eBay once. It froze me to my very marrow I can tell you. Anyway, to enable the purchase I would have to so deplete my family's hoard of gold and precious gems that Berengaria, my beautiful though fiery cousin from Anjou, would probably have come after me with a pike.