Pattycake pattycake make me a bridge as fast as you can

For some reason EVERY time we walk over a bridge FFM does pattycake. He doesn't do it often any other time, but like clockwork every time we walk over the Victoria Bridge he's off. Almost makes me want to walk the bridge just so he'll do pattycake. It's a decent size bridge for those of you not in Brisbane and can get crowded during rush hour (it's one of the main pedestrian/bus/car routes in and out of city center). Strange but true FFM-ism.