All right. You know the routine...a Hollywood studio makes a good movie (Airport, Jaws, Rocky, Superman, First Blood, et cetera, and if it becomes a big hit, the "suits" ask for a sequel or series of sequels to keep milking the cash cow for all it's worth.

Sometimes, as in the case of Superman, the first sequel is almost as good as, and sometimes better than, the original flick, then the quality starts declining until the "series" gets silly and no sane person wants to watch any more follow-ups.

To me, the worst sequels to good movies are:

Jaws 2, 3, and 4

Airport '77 and Airport '79

Rambo III

Superman III and IV

Rocky IV, Rocky V, and Rocky Balboa

Jurassic Park III

Any others?