This Real Ghostbusters t-shirt shows a schematic look at a ghost's worst nightmare, the proton pack. In the Ghostbusters movies and in the unforgettable animated series, the Ghostbusters used proton packs to capture and destroy paranormal characters like Slimer and the Stay Puft Marshmallow Man. This t-shirt shows all the parts that make the proton pack work...as long as the Ghostbusters don't cross the streams!