Occasionally a scene-for-scene lampoon of the original "Scream," "Scary Movie" has taken its basic plot, and added a prominent plot point from "I Know What You Did Last Summer," to unleash its rapid-fire line of gags. Carmen Electra opens the film in the Drew Barrymore role of Drew Decker, a high school student home alone who receives a phone call from a stranger. While jiffy popping some popcorn, they prattle on about their favorite scare movies, including Drew's personal favorite, the Shaquille O'Neal genie movie, "Kazaam!" Soon, however, the fun ends as she is being chased around her house by a killer in a ghostface Halloween costume. She inevitably is killed (but not before getting her clothes torn off and given the opportunity to strike some tantalizing poses while in the midst of her yard sprinkler; getting her breast implant stabbed out; and getting hit by her dad's car while he is receiving roadhead from her mother). If this already doesn't sound like your cup of tea, I hasten to add that this opener is only a relative taste of far raunchier things to come in the next 80 minutes.

The next morning, rumors are abuzz at B.A. Corpse High School, where the innocent virgin Cindy (Anna Faris) suspects the murder is related to a man she and her friends, including her boyfriend Bobby (Jon Abrahams); closeted football player Ray (Shawn Wayans) and his sassy girlfriend Brenda (Regina Hall); hunky Greg (Lochlyn Munro); and his lover, the snotty sex-on-legs Buffy (Shannon Elizabeth), accidentally hit with their car and dumped in the lake a year before, on Halloween. Soon, the six students are receiving threatening notes and being slaughtered one at a time, by someone who knows what they did. Also getting in on the action is cutthroat bitch reporter Gail Hailstorm (Cheri Oteri), who will go to any lengths to get her story, and Deputy Doofy (Dave Sheridan), Buffy's retarded brother.

The less you know going into "Scary Movie," the more unexpected and humorous it will undoubtedly be, so to discuss many of the brighter moments would be unfair. Suffice to say, if ever there was a movie that proves how unjustified the MPAA actually is, it is "Scary Movie." With no less than three scenes showing the male organ (one of which portrays it erect), and an unstoppable barrage of equally naughty behavior and images (does an "orgasmic explosion" mean anything to you?), the film has somehow passed as an R-rating, when much less extreme films have received (1998's "Orgazmo," 1995's "Showgirls") or been wrongfully threatened (1999's "Eyes Wide Shut") with an NC-17. Alas, "Scary Movie" turns out to, indeed, be scary--scary that director Keenen Ivory Wayans and screenwriters Shawn Wayans, Marlon Wayans, Buddy Johnson, Phil Beauman, Jason Friedberg, and Aaron Seltzer (whew!) had the courage to write such un-PC, potentially offensive material. That there are six writers involved in the film is usually a negative sign, but not this time. Apparently, all six had some really slam-bang, witty ideas and they morphed them all together into a sure-to-be-classic whole.

The whole cast of "Scary Movie" keep straight faces throughout, which is the right way to go. By making everything seem serious and real, it only proves more funny for the audience watching it. And if the sold-out audience whom I saw it with is any indication, there is going to be major repeat business just to catch all of the jokes that were easily missed the first time around, in part due to the loud, infectious laughter that swept over everyone.

The token virginal heroine, Cindy, is played by newcomer Anna Faris, and her delicious, likable turn is as good as it possibly could have been. Also taking advantage of the chance to test out their comedic skills are Shawn and Marlon Wayans; the delightful Regina Hall (1999's "The Best Man"), as loudmouth Brenda, who gets her much deserved comeuppance in one of the picture's best scenes, when she causes an uproar at the local movie theater showing "Shakespeare in Love;" Shannon Elizabeth (1999's "American Pie"), who is distraught that her boyfriend is killed until she learns she has just won the town's beauty pageant as Miss Fellatio; and Dave Sheridan and the sadly underused Cheri Oteri (TV's "Saturday Night Live"), as Deputy Doofy and Gail Hailstorm, obvious takes on the David Arquette and Courteney Cox Arquette characters in the "Scream" movies.

"Scary Movie" is never anything less than silly, but amidst it all are some fairly knowing moments of social commentary, including material on race relations, homosexuality, the portrayal of teenagers in Hollywood movies, as well as sly truths about teenagers and young adults. After hitting the unknown man with their car and deciding to do away with the body, Buffy says to Cindy, "We'll just pretend it never happened. Like the time we were drunk and went down on each other." It may not be art, but it does have a ring of honesty to it.

When film parodies work, they really smoke, but it is a particularly tricky genre in which most attempts fail. For every "Airplane!," there is a "Spy Hard," a "Wrongfully Accused," and a "Jane Austen's Mafia!," and "Scary Movie" is one of the very, very few recent ventures that belong in the former category. If you are in the mood to go to the movies, have a great time and a lot of big guffaw laughs--oh, and if you aren't faint of heart--it would be absolutely foolish to pass up "Scary Movie."