Two

Gus McClain:
[From the shows introduction] I didn't kill my wife

Booth Hubbard:
[Appears behind Gus] But I did

Gus McClain:
I never knew I had a brother

Booth Hubbard:
I couldn't live your life [Smiles with devilish glee] So I arranged for you to live mine

Gus McClain:
You can stop smiling you've won

FBI Agent Theresa 'Terry' Carter:
I've not won... not until I see you being executed in the chamber

Booth Hubbard:
[singing on the phone to his brother] Happy Birthday... to us... Happy Birthday... to us Happy Birthday... Booth & Gus... Happy Birthday... to us

Gus McClain:
You're doing this because of how I lived?

Booth Hubbard:
I DESERVED THAT LIFE

Gus McClain:
I'm coming after you... you know that

Booth Hubbard:
I'm counting on that

Gus McClain:
[to a teenage would-be-murderer] You don't have it in you to kill... but I do

Gus McClain:
A man hurt my wife... he hurt her... till she was dead

Col. Maxwell Foley:
[seeing both Gus and Booth locked up in separate cages] SO... the 'evil twin' theory is true

Col. Maxwell Foley:
[about to shoot Gus convinced Gus is the twin who killed his daughter] You know once I do this... my whole purpose in life... ends

Soldier:
[Holding a rifle on Gus as Booth is being dragged away] I don't know who you are... but you're coming with me

Gus McClain:
[as Booth frees him] What are yo doing?

Booth Hubbard:
What does it look like? I'm continuing the game

Booth Hubbard:
[as he shoots Maxwell] Hey Colonel... you've got the wrong man