Get. Out. Of. The. Water. Why? Well, it seems that someone spotted a shark swimming along the coastline just off of Stinson Beach, prompting authorities to shut down the beach to the public. CBS5 reports, "Golden Gate National Recreation officials told CBS 5 that they received two 'reliable' shark sighting reports on Monday. As a result, officials said they made the determination to close the beach for 5 days." Although Great White Shark attacks are relatively common in the area, insofar as shark-to-human attacks go, it wasn't know what shark, exactly, was spotted.