A few months ago I was watching a new episode. In typical show fashion, Jamie and Adam pursued one myth while co-hosts Kari Byron, Tory Belleci and Grant Imahara pursued a different one. If I remember correctly Jamie and Adam were cutting up an old Porche sports car to see if it was more aerodynamic going backwards than forwards. The other segment was about the myth that a car with a surf board on the roof, involved in a head-on collision, would propel the surfboard with enough energy to penetrate the windshield of the second car and kill the driver. The myth was from the movie Lethal Weapon 2. They start out by conducting full scale tests by recreating the crash scene. After making observations they decide to analyze why the board failed to fly straight and hit the target windshield. The full episode can be seen in two parts here: http://www.youtube.com/watch?v=cYVwmXor5eM and here: http://www.youtube.com/watch?v=fXMgc4xaiwg&feature=related. The surfboard myth starts at the 6 minute mark of part one. Kari wants to build a small scale model of the surfboard and bring it for flight analysis in a water tank at NASA. Her first attempt at building the scale model is by hand. She quickly realized that for this test she would need accuracy and turned to CAD and 3D printing.
This segment starts at the 10 minute mark of the part two of the video and includes Kari pulling the miniature surfboard from a ZPrinter 450.
I’ll let you watch the episode to see if it was proven or busted!