Intertextuality

Intertextuality -  "Relating to or deriving meaning from the interdependent ways in which texts stand in relation to each other"
To put it simply, films incorporate scenes and use ideas that have been used before. One of the most famous examples is the shower scene in the 1960s film Psycho



Many other films have used aspects that they have borrowed from this scene. Such films as: 


Fatal Attraction -
This scene has incorporated the ripping of the shower curtain from Psycho and they have also used a knife near enough identical to the one used in Psycho. 

What Lies Beneath -

This movie has used setting that is very much like the setting used in Psycho, everything is very similar even down to the shower head.