<p>The reason you only see one line even though the laser "pointed" at the DSLR sensor a few times in the second video, is because of the angle. Watch closely in both videos and you'll see the point where the line appears is when the source of the laser is perpendicular to the sensor.</p><p>It is only when the sensor can see the source of the laser, that the photos cause the damage. Many scientific experiments that used digital cameras to record data where lasers were being used, suffered the same fate. Eventually, some observant people noticed that you can point a laser at a CMOS sensor without damaging it, as long as your sensor is never facing the source directly.</p><p>NOTE: While there have been some instances where multiple lines have shown up on CMOS sensors, it's rare. Additionally, many sensors *can* be reset (though not always) if you simply shoot a solid white wall with some strong overexposure.</p><p><a href="http://petapixel.com/2010/07/28/what-laser-light-can-do-to-your-precious-dslr-sensor/">Keep reading...</a></p>