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Listen to the sound clip Are you 100% sure that theory of yours is correct? from Half-Life Soundboard:

Are you 100% sure that theory of yours is correct?


This sound is from Half-Life Soundboard

Half Life is a critically acclaimed first-person shooter video game developed by Valve Corporation. Players assume the role of Gordon Freeman, a scientist fighting for survival against alien enemies and government forces.
See also: Half Life video game, first-person shooter, Gordon Freeman, G-Man, Valve Corporation.

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