Airboat - take a 400 hp V8 CAST IRON block and mount it about five feet up, behind you, on a short, wide, open aluminum boat(with the buoyancy foam removed - dont want it melting when you spill all that 100 octane). Put a big propeller on it, and use it primarily to catch frogs. Apparently the frogs don't run away - I figure they are too amazed.