Portal 2 Sounds | Cave Johnson: Thank you - I can't believe I'm thanking these people - for staggering your way through Aperture Science's propulsion gel testing. You've made some real contributions to society for a change, and for that, humanity is grateful.

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Thank you - I can't believe I'm thanking these people - for staggering your way through Aperture Science's propulsion gel testing. You've made some real contributions to society for a change, and for that, humanity is grateful.

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Who: Cave Johnson

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