Three former parapsychology professors set up shop as a unique ghost removal service.
 
No review.  Just a quote from the movie.
 
Dr. Raymond Stantz: Symmetrical book stacking. Just like the Philadelphia mass turbulence of 1947.
Dr. Peter Venkman: You're right, no HUMAN BEING would stack books like this.
 
Nuff said.
 
FUN FACT:  The role of Winston Zeddemore in Ghostbusters (1984) was originally written with Eddie Murphy in mind and was meant to be much bigger, but Murphy turned it down in favour of starring in Beverly Hills Cop (1984) and the role went to Ernie Hudson.