In the episode "Leslie Makes It Big", Leslie built a mind-control device in the form of a giant Squishy Bunny. She was probably inspired by Mr. Big to make a Bunny. Mr. Big once bought a special Bunny through the mail, claiming it was the squishiest Bunny ever to be squished by mankind. But it was used as a diversion near the end of the episode, so it is unclear if he has it currently.