Under 17 requires accompanying parent or adult guardian 21 or older. The parent/guardian is required to stay with the child under 17 through the entire movie, even if the parent gives the child/teenager permission to see the film alone. These films may contain strong profanity, graphic sexuality, nudity, strong violence, horror, gore, and strong drug use. A movie rated R for profanity often has more severe or frequent language than the PG-13 rating would permit. An R-rated movie may have more blood, gore, drug use, nudity, or graphic sexuality than a PG-13 movie would admit.
Somehow both the only _Ghoulies_ movie with any sort of continuity and yet also the least related of the series. _Ghoulies IV_ takes place an undetermined amount of time after the first movie, and ignores the events of the second and third. It also doesn't have any Ghoulies in it. You know, the things that the franchise is named for. The only service that it does do for the franchise, is to be so...
