Let Me In Trailer/

I thin that this trailer can challenege the typcial conventions of horror, for example: the music is quite upbeat and isn't the kind of music you'd expect there to be. It's not creepy and doesn't create suspense, and it stays the same the whole way through. There isn't any voice over.
Although, the trailer does contain a lot of the typical horror use of darkness, especialll when there are some shots of a man in a tunnel, where it's very dark and you can hardly see anything. This creates suspense.
There are a lot of fast cuts involving action - where you can see what's happening, but not everything, which is typical of horror to draw the audience in.
The intertitles are also the kind you'd expect to see as they're quite dark in background with white writing that really stands out.