Trampoline

From Toontown Rewritten Wiki

A trampoline is a device that makes Toons jump up and down. They are mainly found in parties and the Cartoonival Grounds as activities for earning jellybeans and Cartoonival tokens, respectively. The purpose of using a trampoline is to jump as high as possible, done by pressing the default Ctrl key. The higher a Toon gets allows them to be awarded more, though it is important to time the Ctrl press correctly.