Rescue 911/Awesome

Virtually the entire show. Aside from the very well-done recreations of the incidents, just about every story involves everyday people or emergency personnel stepping up to save lives. Though this troper has always been most impressed by this police officer who chased down a pair of runaway boxcars that collided with a car and bringing them to a halt before they crushed the vehicle against a bridge.
Here's a nice, specific, badass example. A boy is attacked by a crocodile. He is rescued by, among other people, his father, who gets his arm bitten clean off by said croc. The father proceeds to oversee his son's care, does everything he can to help, and at the end of the segment we learn that he saved his son by punching the crocodile in the face until it let go of the son and attacked the father instead. In a show built basically out of Real Life Big Damn Heroes moments, he's pretty much at the top.