This short film was an ad for Ghostbusters, filmed by Bill Murray and John Ackroyd (in character as Drs. Venkman and Stantz) to convince independent theater operators to run the forthcoming movie itself. Todd Spence uploaded it to to Twitter, and found a more complete version of the unused original theme tune—but not the complete [&]

https://boingboing.net/2020/09/08/the-ghostbusters-teaser-shot-t.html