Oceans have moods. Some days the surface is placid only sparkling diamonds of sun dancing off ripples, while in contrast, storm clouds form, the wind whips the water into white cresting waves. Viewing the sky from shore, the sun is consumed by dark clouds and waves crash to shore in anger. Parkinson's can be similar. Some believe Parkinson's only affects the muscular system, it also creates depression from the lack of dopamine. One's sunny personality can transform into a raging storm of anger.