Dan Aykroyd, Bill Murray, Harold Ramis, and Ernie Hudson in Ghostbusters (1984)

Sigourney Weaver and Rick Moranis in Ghostbusters (1984)

Dan Aykroyd, Bill Murray, and Harold Ramis in Ghostbusters (1984)

Dan Aykroyd and Ernie Hudson in Ghostbusters (1984)

Ivan Reitman at an event for Ghostbusters (1984)

Ivan Reitman at an event for National Lampoon's Animal House (1978)

Dan Aykroyd, Bill Murray, Harold Ramis, Ernie Hudson, Ivan Reitman, and Mark Bryan Wilson in Ghostbusters (1984)

Dan Aykroyd, Bill Murray, Harold Ramis, and Ruth Oliver in Ghostbusters (1984)