This is Tilly's first time trying to pop a balloon with her butt. She is wary of sitting on it, but I tell her it's hard to pop. She sits on the balloon and eases into it slowly and becomes more assured. I encourage her to throw herself onto the balloon in an attempt to pop it; soon she starts laughing and getting more into the moment. Listen to Tilly grunt while she furiously bounces up and down. She finally pops it with her butt, Runtime 4:46 640 x 360 Windows Media video