Final answer:
In Shakespeare's Hamlet, the ghost of Hamlet's father foreshadows the corruption and deceit in Denmark, exemplifying the idea of Elsinore being a prison.
Step-by-step explanation:
An example of foreshadowing that indicates something is wrong in Denmark can be found in Shakespeare's play Hamlet, where the ghost of Hamlet's father appears to tell Hamlet that he was murdered.
This supernatural event suggests that not all is well in the state of Denmark, hinting at the corruption and deceit which Hamlet will later uncover.
The ghost's appearance acts as a grim omen foreshadowing the tragic events that will unfold throughout the play, encapsulating the notion that Elsinore is a prison for both the body and the mind, as the characters are entrapped by secrets, lies, and moral corruption.