If you were horrifically fascinated (horrafinated?) by the sinkhole that swallowed Floridian Jeff Bush and his entire bedroom a week ago, you might be interested in some sinkhole science. The US Geological Survey says that sinkholes are a geologic thing. Certain areas of the country are more prone than others (which you probably knew already). But the formation of actual sinkholes in those sinkhole-prone environments can apparently be prompted by human activities, ranging from old mines that weaken the ground above them; to groundwater pumping that destabilizes the soil; to (get this) leaky faucets. The USGS does not say how many leaky faucets, or how bad a leak, it might take to trigger a sinkhole, but the basic idea is that saturating usually dry soil could cause it to shift, so you'd assume it would have to mean a lot of water leaking into the soil under the house.