I'm looking for a certain movie from I think early 90's?

Pretty sure you are talking about Heart And Souls
http://en.wikipedia.org/wiki/Heart_and_Souls
http://www.imdb.com/title/tt0107091/

I suspect that you are referring to The Sixth Sense. The promotional catch phrase was the little boy saying: "I see dead people."

that's what I was thinking as well.

The Frighteners is a comedy horror film with Michael J Fox as a psychic who has ghost friends.

Except by no stretch is Sixth Sense a comedy.

In Heart and Souls the spirits of four very different people who die in a bus crash attach themselves to a baby born in the same crash. They are his permanent 'imaginary friends' while he grows up - keeping him very happy and company until he gets to the age where he realises no-one else can see them. I think around age 12 he tells them to leave him alone (tired of being a freak basically) and they go (well they hide for the next ten or fifteen years - but they are inextricably linked to him so never far.

They re-initiate contact and the bulk of the film is them trying to get him to help them get closure/peace - one by one the bus comes back and takes them to heaven - while the lead's life is largely left in tatters by his odd behaviour (which is very reminiscent of the 'troubles' he had growing up.

All ends well - the four die happily ever after. It's a romantic comedy of sorts.

Yeah - I've seen that one as well - but my first image was of the sixth sense. I agree it is not a comedy - but was thinking of the twist in the end (not quite a black comedy) but find it kinda funny in a dark way.

Yeah - true, it did have some quirky moments.