Juror #8 realizes that he might not be able to convince the other men of a "Not Guilty" verdict if they keep going around the room. So he risks everything by asking for a secret ballot and gets the men to vote again. He says if all eleven men vote for a "Guilty" verdict, he'll go with them and send the kid to the chair.
The votes come back to Juror #1, who reads them out loud. One by one, he reads the word "Guilty" until he arrives at one that says "Not Guilty."
We find out after some argument that it was the old man, Juror #9, who ended up changing his vote. While he tries to explain why, Juror #7 walks out of the room. So Juror #1 decides to have the whole group take a break, and they start to banter.
Juror #3 (the angry dude) tries to apologize to Juror #5 (the dude from the slums) about getting mad at him, but #5 just walks back to his chair.