The Movie Timeline - it's like a timeline, but of movies
Ghostbusters - timeline
The Tunguska blast, a major interdimensional time-rip, occurs.
The 'City of Albany' central train derails killing hundreds of people, later to become a ghost train. (New York)
Philadelphia Mass Turbulence, related to 'symmetrical bookstacking'. (Philadelphia, PA)
Raymond Stantz, Egon Spengler and Peter Venkman form the Ghostbusters.