Sometimes people can just have mind-numbing confidence. One man had the guts to go up against a whole army. From David Eddings' "Queen of Sorcery":
"I will challenge them." Mandorallen announced calmly, "One or all. No true knight would refuse me without being called craven. Wilt thou be my second and deliver my challenge, my lord?"
"What if you lose?" Silk suggested.
"Lose?" Mandorallen seemed shocked. "I? Lose?"