In movies such as horror, action, disaster; the main character is an ordinary guy, maybe an artist, doctor, teacher or accountant.
He is put into a crisis with a group of people. His profession and past experiences shouldn't give him any insight into the situation that anyone else would have but he is still full of plans and suggestions.
No one listens to him and people start dying. Then people begin to take him seriously but as soon as he starts acting like a leader the crowd begins following another character who's ideas have been repeatedly been proven wrong.
Everyone else dies except the main character and his ex-wife/ex-girlfriend/new love interest, a little kid, and an old person.