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Proton Pack - Ghostbusters

The Ghostbuster's Proton Pack is a back-pack carried portal nuclear accelerator used to pin down and capture ghosts. It fires a steam of protons which attract the ghost's negatively charged energy and keep it from running away. What's cool about the Proton Pack is the way its beam undulates wildly and the rather destructive affect of the beam on physical objects. Crossing two proton streams was strictly discouraged in the movie, until doing so was necessary to seal the Gozer in his portal.