Head-on collisions don't get scarier than this.
As far as crash videos go, this is one of the most amazing you'll ever see. It's shot on a GoPro that appears to be mounted to the chest of a motorcycle rider who is cruising down a mountain road with his buddy. The guy's friend is in the lead and disappears around a bend, and that's when stuff goes south. The cameraman exits the bend and heads straight into the path of an oncoming fire truck, colliding with it and flying off his bike.
The video is pretty damn intense so be prepared to freak out around the 11:00 mark if you're faint of heart. The good news is that while the rider was badly hurt he's recovering with no lasting injuries.