Intertextuality is the referencing between films, they quite literally, borrow from each other. It's seen many times in thrillers, and often includes aspects of mise en scene e.g using a kitchen as a setting were commonly used props like knifes can be found. It could also include sound, editing techniques and camera angles that have been influenced by other films like the shot of a long corridor seen in many thrillers. This interests me as I feel intertextuality is a great way in which thrillers can build suspense. We recongnise the reference, as we have seen them used so many times. Therefore we know something is going to happen and have a feeling of apprehension of what it going to be, and when it will happen.
This famous shower scene from Psycho, has been borrow for several films:
What lies beneath
The Godfather part 2 (1946)