"Ghostbusters" is often referred to as a cult classic, about three misfit paraphsycologists, Peter Venkman (Bill Murray), Raymond Stantz (Dan Aykroyd) and Egon Spengler (Harold Ramis) who eventually are called to investigate an unusal happening at the New York Public Library. They soon discover that they are  no match for the ghost of the dead librarian by themselves so they eventually show up with "equiptment" that they made themselves and defeat the librarian. But they have bigger fish to fry when  they gain noterity and are retained by Dana Barett whose apartment is haunted by an evil spirit called "Gozer" and they eventually go on to save all of new York from the forces beyond the grave.

I love Ghostbusters, my father got me into it as a child and it hasn't really ebbed.