Special Effect in "Ghost"

[Denisse]

Hi Everyone,
I was wondering how they made the special effect of the shadowy evil spirits that came out of the streets in the 1990 movie "Ghost" starring Demi Moore and Patrick Swayze? Is this something that will be super expensive to try to pull off?

Thanks!

 

[MarkG]

I don't know how they did it then, but today I suspect you'd do it as CG. Probably not too hard if you know someone who's competent at animation and compositing.