At the risk of sounding like a hair-splitter, I wasn't really scared of Signs, but I found it very tense. A fine line, maybe. But the difference was stark with my friend Adam; when I saw it with him, he was absolutely terrified and bit a hole in his shirt on the drive home.
Some people are just super-freaked about the idea of aliens, specifically. I find ghosts scarier. There's an old thread around to this effect that I might revive, where I suggest that the difference is between an object of fear you can still potentially reason with (aliens) and one you can't (ghosts). The disagreement was about whether or not it was scarier to deal with an obsessive mindlessness, or a mind that understood what you wanted and went after you anyway.
Some people are just super-freaked about the idea of aliens, specifically. I find ghosts scarier. There's an old thread around to this effect that I might revive, where I suggest that the difference is between an object of fear you can still potentially reason with (aliens) and one you can't (ghosts). The disagreement was about whether or not it was scarier to deal with an obsessive mindlessness, or a mind that understood what you wanted and went after you anyway.