Man, I forgot how well Airplane! holds up. Hilarious movie -- if you haven't seen it, get on that right away.
Now for the next choices!
1. The Day the Earth Stood Still (1951): An extraterrestrial ship comes to Earth, and from it emerges the alien life form, Klaatu, who announces that he is on a mission of goodwill. After an initially violent reception, Klaatu says that his people have grown wary of Earth after humanity has developed atomic power. If Earth continues in an aggressive direction, the planet shall be eliminated. Will humans learn to stop being so violent? Directed by Robert Wise, starring Michael Rennie, Patricia Neal and Billy Gray.
2. Clue (1985): Six strangers -- the famous house guests of the Clue board game -- are invited to a mansion during a stormy meeting. They are greeted by the butler, Wadsworth, and soon find out that they are each being blackmailed by their host, Mr. Boddy ... who then winds up dead. Somebody in the house is a murderer, and he or she must be caught before everyone winds up dead. Directed by Jonathan Lynn, starring Tim Curry, Eileen Brennan, Martin Mull, Leslie Ann Warren, Michael McKean, Madeline Kahn and Christopher Lloyd.
3. The Thing (1982): A group of scientists in the Antarctic find the burned remains of an unknown creature with human-like features and organs. They eventually discover that the alien life form is capable of assimilating with other creatures and perfectly mimicking their forms. Anyone -- or anything -- among them could be the alien. Directed by John Carpenter, starring Kurt Russell, Wilford Brimley and Keith David.
4. Laura (1944): Detective Mark McPherson is investigating the murder of a successful advertising agent, Laura Hunt, and pieces together her life through interviews with her shady fiance, Shelby; wealthy aunt, Ann; and her acid-tongued mentor, Waldo Lydecker. As McPherson learns more about Laura, he slowly falls in love with her, despite the fact that she is dead. And Laura's ghost continually hangs over his interactions with those most involved in her life. Directed by Otto Preminger, starring Dana Andrews, Gene Tierney, Clifton Webb and Vincent Price.
5. The Night of the Hunter (1955): A serial killer and self-proclaimed reverend, Harry Powell, learns about some money stashed away by his prison cellmate, who is to be hanged. Powell escapes from prison and finds and woos the man's wife, convinced that the children know the whereabouts of the money. He slowly breaks down his new wife and attempts to force the location out of the children, but they are determined to protect their father's secret. Directed by Charles Laughton, starring Robert Mitchum, Shelley Winters and Lillian Gish.