You would be blown in excess of 1000 mph off your feet until you slammed into something splattering you all over the place. The reason for this is because even though we dont feel it, we are moving along with the planet. Gravity keeps us in place. If the earth stopped suddenly, we'd still be moving and thrown foward. There would be massive flooding and waves as the water is tossed about other items as well. Dont know what would happen next because every living thing would be dead.