How does juror number eight in the Twelve Angry Men dispove the old man's testimony?

Answer 1

Juror #8 (Henry Fonda) dispels the old man's testimony by posing a question to fellow jurors:

"How could the old man in the apartment downstairs distinctly hear the threat and the body hit the floor a second later, while the woman across the street was viewing the killing through the last two cars, when an El train was making a deafening noise as it passed?"

Juror #9 (Joseph Sweeney) answers with an opinion:

"Maybe...The seam of his jacket was split under the shoulder...to come to court like that...He was a very old man in a torn jacket and he walked very slowly to the stand. He was dragging his left leg and trying to hide it because he was ashamed. I think I know this man better than anyone here. This is a quiet, frightened, insignificant old man who has been nothing all his life - who has never had recognition - or his name in the newspapers. Nobody knows him. Nobody quotes him. Nobody seeks his advice after seventy-five years. Gentlemen, that's a very sad thing to be nothing. A man like this needs to be quoted, to be listened to, to be quoted just once - very important to him...He wouldn't really lie. But perhaps he made himself believe that he heard those words and recognized the boy's face."