Anyone else see Mythbusters last night? The were testing the theory that, if you get caught in a rainstorm with the top down, driving faster will keep you drier. They were using a Carrera Cabriolet (looked like a 997.1) and a bank of overhead water sprinklers set up on an airstrip. Bottom line, they were able to show that the air stream from the hood and windshield would force the water over the top in a sheet that would miss the passenger compartment, the faster you go the drier you stay.
Wonder what would happen if they encountered a real Southern frog strangler downpour?