I just acquired an old-fashioned baby carriage, and I would like to use it on my haunted hayride. I am thinking of glow sticks inside to give it an eerie glow, and playing sounds of weird distorted baby crying. I'd like to have it shake at some point, suggesting there is something violent and scary inside. I have no power source as this is in the woods- can anyone give me an idea of an easy, low-tech way to make the carriage shake?