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13. Mark Zuckerberg
Creeped us out in: The Social Network (2010)
The ruthless, arctic-cold tech whiz (Jesse Eisenberg) invents Facebook—and Facebook stalking.
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12. American Photojournalist
Creeped us out in: Apocalypse Now (1979)
The T.S. Eliot-quoting acolyte (Dennis Hopper) is unnerving in his intellectualized devotion to the mad Colonel Kurtz.
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Creeped us out in: Willard (2003)
''Controls an army of rats'' is probably something the Crispin Glover character should leave off his OKCupid profile.
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10. Barbara Covett
Creeped us out in: Notes on a Scandal (2006)
Judi Dench's cunning spinster becomes obsessed with a naïve colleague, then sabotages her marriage and career.
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9. Sean Walsh
Creeped us out in: Circle of Friends (1995)
Alan Cumming's handsy, sleazy lech preys on Minnie Driver—all while looking like a Batman villain.
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8. Seymour Parrish
Creeped us out in: One Hour Photo (2002)
You'll be grateful for digital photos after watching Robin Williams as this disturbing picture-developing voyeur.
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7. Lou Bloom
Creeped us out in: Nightcrawler (2014)
Jake Gyllenhaal's videojournalistic predator must have left his moral compass in his other pants.
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6. Rupert Pupkin
Creeped us out in: The King of Comedy (1982)
The late-night wars have been bad at times, but at least no one's gone as far as the fame-starved, host-kidnapping weirdo (Robert De Niro).
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5. Duane Hall
Creeped us out in: Annie Hall (1977)
Before playing more prominent oddballs, Christopher Walken was Annie's bizarro brother, who threatens to heed l'appel du vide.
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4. Harlen Maguire
Creeped us out in: Road to Perdition (2002)
Jude Law's sallow, noxious assassin is like the period-piece hit-man version of Gyllenhaal's Nightcrawler character—a photography obsessive who steps over the line between documenting and executing crimes. Plus his teeth are pretty grody.
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3. Arthur Leigh Allen
Creeped us out in: Zodiac (2007)
John Carroll Lynch's suspect carries knives, kills chickens for dinner, and says icily (and unconvincingly), ''I'm not the Zodiac. And if I was, I certainly wouldn't tell you.''
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2. Nurse Ratched
Creeped us out in: One Flew Over the Cuckoo's Nest (1975)
Purse-mouthed and unyielding, Louise Fletcher's villain embodies the ills of authority.
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1. Travis Bickle
Creeped us out in: Taxi Driver (1976)
You tawkin' to him? If so, watch out. The vigilante cowboy (Robert De Niro, representing again!) has killed. And he's terrible at first dates.