Knowing something is incredibly stupid that makes sense to do, but you know you'll get your ass kicked for doing it. And still you step up and do it because no one else will. Or confronting you're worst fears but acting like it's nothing and facing down the fear.
A professor in a university once stressed a huge test that was coming up that was worth 3/4 of your total semesters grade. When the students got the test they were stunned. There was only one question:
What is bravery?
all the students got to work and wrote for hours, except one he tapped his pencil on the desk, smiled, andtook the test up to the teacher. It was handed back to him with a 100% at the top.
The students answer was:
This is Bravery.