David Linde and Marc Shmuger, who were ousted Monday as co-chairman of Universal, might very well have the satisfaction of learning that one of the films that they greenlit, Couples Retreat, turned out to be a hit. Box-office forecasters are saying that the romantic comedy -- the only film that is opening wide today (Friday), will probably take in $25-30 million over the weekend to take the lead position. The studio has not had a No. 1 hit since last April's Fast and Furious. Analysts are also keeping a close eye on the performance of Paramount's Paranormal Activity , the $15,000 Scary Movie that has been packing 'em in at midnight screenings in limited release. The film will be expanding to 159 theaters and play during regular hours beginning today.