The Big Bang Theory Wiki
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“Scanners” is a Canadian-American 1981 film that involves people with psychic and are used as weapons. One scanner turns against the organization and is powerful enough to make people's heads explode. Scanners has spawned sequels, spin-offs and a remake that never went into production.

In “The Cooper-Hofstadter Polarization” Sheldon tries to blow up Leonard's head when he annoys him. Penny mocks Sheldon later when she tries to blow up Howard's head.

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