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The Philadelphia Mass Turbulence of 1947 was an event of high psychokinetic activity. Not much is known of the event except it was one of the most impressive forms of Symmetrical Stacking to date.
- The Philadelphia Mass Turbulence of 1947 appears to have derived from the Manse Turbulence from the August 5, 1983 draft of Ghostbusters. On page 40, Ray tells Winston about a documented case from Pennsylvania, the "Manse Turbulence." He listed the occurrence of major structural damage, the appearance of multiple full head and torso manifestations, and ecto fluids.  
- A Manse is an old farmhouse.
- On page 22 of Teenage Mutant Ninja Turtles/Ghostbusters Issue #2, there is a non-cameo reference to the Philadelphia Mass Turbulence of 1947 on an article on the right in Ray's locker.
- ↑ Aykroyd, Dan & Ramis, Harold (1983). Ghostbusters (First Draft August 5, 1983) (Script p. 40). Ray says: "These are documented. Did you ever hear of the Manse Turbulence? Farmhouse in Pennsylvania --major structural damage, multiple full head and torso manifestations-- ecto fluids. Boy the walls were alive on that one. And I'm willing to bet that for every reported supra-phenomenal occurrence, there are at least 75 to 100 that go unreported.""
- ↑ Aykroyd, Dan & Ramis, Harold (1983). Ghostbusters (First Draft August 5, 1983) (Script p. 41). Ray says: "About us being on the verge of a rip...massive rip like the Manse Turbulence or the Tunguska Blast... you know, a four-fold crossover""