Mafia hitman Tommy Spinelli is flying to San Diego with a bag that holds eight severed heads, which he's bringing to his superiors to prove that some troublesome rival mobsters are permanently out of the picture. When his bag gets accidentally switched at the airport, Tommy must track down his duffel bag and the 8 heads it contains.

A student gets his senses enhanced by an experimental drug. But abuse is not an option.

When dignified Albert Donnelly runs for Governor, his team moves to keep his slow-witted and klutzy younger brother, Mike, out of the eye of the media. To baby-sit Mike, the campaign assigns sarcastic Steve, who gets the experience of a lifetime when he tries to take Mike out of town during the election.

Jack Sadelstein, a successful advertising executive in Los Angeles with a beautiful wife and kids, dreads one event each year: the Thanksgiving visit of his twin sister Jill. Jill's neediness and passive-aggressiveness is maddening to Jack, turning his normally tranquil life upside down.

A pair of aliens arrive on Earth to prepare for invasion, but crash instead. With enormous cone-shaped heads, robotlike walks and an appetite for toilet paper, aliens Beldar and Prymatt don't exactly blend in with the population of Paramus, N.J. But for some reason, everyone believes them when they say they're from France.

Nervous high school senior Tom Lawrence visits Port Chester University, where he gets a taste of politically correct college life when he's guided by fraternity wild man Droz and his housemates at The Pit. But Droz and his pals have rivals in nasty preppy Rand McPherson and the school's steely president. With their house threatened with expulsion, Droz and company decide to throw a raging party where the various factions will collide.