Judging by Stuff magazine's November cover story, "The Scariest Movie Ever Made," I know that former extraterrestrial pinup and now star of TV's Shark, Jeri Ryan, is a big baby.

That's because she chose The Sixth Sense as one of the magazine's Top 30 most frightening movies ever made.

The same goes for How I Met Your Mother's Neil Patrick Harris, who chose the dizzying The Blair Witch Project as a frightening film he can't sit through, and The Amazing Race host Phil Keoghan, who apparently can't watch Planet of the Apes without going ape.

"It freaked the eff out of me," Keoghan admits.

"To this day, the scene of Charlton Heston walking down the beach with the Statue of Liberty haunts me."

And as big scaredy-cats as they are, they don't come close to Kill Bill heroine Uma Thurman or American Idol cheerleader Ryan Seacrest. Both admit that they're too sensitive to even rent a horror flick and watch it at home.

"I cry at romantic comedies. I scream at horror movies. I can't watch them, I'm afraid of them," Seacrest laments with way too much sincerity.

What's wrong with these people?

After surveying 100 Hollywood directors, producers, stars and special effects professionals, Stuff, the cheeky men's monthly, managed to distill a list of the 30 most frightening films of all time, in time for Halloween.

The Top 5 scariest films begins with William Friedkin's nightmarish epic of demonic possession The Exorcist, followed by Rosemary's Baby, The Shining, Halloween and Jaws.

Every flick in the Top 5 has a couple of things in common, points out Stuff's executive editor Dan Bova.

"The consensus on what made a scary movie really scary came down to one thing," Bova observes. "Call it believability or psychological resonance, but when people felt these horrible things that they were watching could actually happen to them. That's what makes movies really scary, not aliens from outer space."

"It just has the power to scare the living crap out of anyone who sees it because you think that 'this could happen to me,' " Bova says.

"James Woods says that the movie (The Exorcist) has been spoofed a million times, but when it came out it was truly scary. It's true because it's a horror film that really hits home."

The 40 Year Old Virgin and The Office star Steve Carell agreed with Woods. "The scariest movie I ever saw was The Exorcist because it was unrelenting. They made it seem like it was absolute reality ... I was a little kid too. I think that helps -- when you're young and a movies gets inside your head."

"People talk about Jaws," he adds. "You almost never even see the shark. The threat is even scarier than actually seeing the thing. It's in the imagination."

The other thing the scariest movies shared was that they didn't rely on computer-generated graphics to tickle the scary-bone.

"A lot of the top movies are older movies that didn't have the special effects that we have now, they had to do a lot more to scare you rather than leave it to a computer," Bova adds.

Other terrifying classics that work more on the powers of suggestion were House on Haunted Hill, Don't Look Now and The Haunting.

Less frightening but equally list-worthy are gore and gross-out masterpieces such as Alfred Hitchcock's Psycho making the list at No. 7 and Alien at No. 10, (which Studio 60 on the Sunset Strip star Timothy Busfield claimed grossed him out so badly that he was "so glad I had Mexican food before I saw it, because it stayed in my esophagus for about four days. So gross.")

Surprisingly, not making it onto the list was The Texas Chainsaw Massacre or anything European.

"Those movies have their value," Bova says. "They deliver the quick-shock scare as opposed to the movie that lingers with you."