I don't like scary movies. I don't get any enjoyment from experiencing fear. I don't understand why someone would get enjoyment from experiencing fear, although I acknowledge that some people do. When people tell me that they couldn't sleep for a month after seeing the horror film of the month, I get the urge to ask "So why did you watch it?"
In a commercial I recently saw, a couple expresses their love for each other, and then girl climbs into bed, and then sudden turns to face the guy, her face all disfigured, eyes missing, etc. It turns out this was a commercial for the film Boogeyman. It seems to be very inconsiderate to "force scariness" onto people like me (and I'm sure there are others out there who also don't experience joy from fear). Most trailers for scary movies I've seen make it obvious from the beginning that this is a commercial for a scary movie, and so you have the freedom to refrain from seeing the scary bits if you want. From a marketting point of view, this commercial will probably only offend the segment of the audience who wouldn't have seen the movie anyway, but from a humanatarian point of view, it just seems mean to me.
On a somewhat semi-related topic, you may be familiar with those Flash animations in which one tricked into staring at what initially seems to be a peaceful scene only to have something jump out and scream at you. I wonder why people send this to each other. Some claim it's funny to see (or even to just imagine) the reaction of the recipient getting startled, but laughing at someone else's misfortune is like saying you punch people in the face because you like the goofy look of shock and pain they have as they receive the blow. Similarly, rationalizing your actions by saying the guy you sent the Flash to is just gonna send it to his own friends is like saying the "punch-joke" was okay, 'cause he can perform it on his friends too. The only other explanation I can think of is, being embarassed of being a victim of the prank, you feel the urge to prove that you were no stupider than your friends, who would also fall for the prank, by actually going out and playing the prank on your friends. Pure immaturity.