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![In Terminator 2: Judgment Day (1991), when the T-1000 knocks on the glass door, the sound is heard as metal hitting glass because he's made of liquid metal. Earlier in the film, In Terminator 2: Judgment Day (1991), when the T-1000 knocks on the glass door, the sound is heard as metal hitting glass because he's made of liquid metal. Earlier in the film,](https://external-preview.redd.it/oWfM12GidVcg5dZax0MYOac0ZMKgO7ZBivtlbFLEa5g.png?format=pjpg&auto=webp&s=5a0d1e96172de79f08988a0709594bb86e792821)
In Terminator 2: Judgment Day (1991), when the T-1000 knocks on the glass door, the sound is heard as metal hitting glass because he's made of liquid metal. Earlier in the film,
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