Many of us have seen the video of the aircraft hangar accidentally filled with white, billowy, high-expansion fire suppression foam during a hangar system test that ran too long. (Click on YouTube and type “Fire Foam Test Goes Very Wrong!” in the search box.)
Yes, I mean the one where the hangar doors were opened afterward and the foam seemed to flow out onto the aircraft operations area, almost engulfing a small jet sitting outside the hangar.