How does this happen?

A car crashed into a semi-truck on I-15 going through the Cajon Pass in California, but the trucker had now idea he was dragging the car up the mountain. Probably the greatest part of the video that was posted to Facebook is when the poor guy in the car rolls down the window and begs for help. Check it out (if that video doesn’t load below, try here):

According to California Highway Patrol, there were no injuries and no criminal charges were filed against the truck driver.