Dramatic Irony occurs in theater when the audience knows something about which the character on stage doesn't have a clue.
The the wiki defines it as "the device of giving the spectator an item of information that at least one of the characters in the narrative is unaware of (at least consciously), thus placing the spectator a step ahead of at least one of the characters."
In other words, Hope has no idea what's coming.
Or, in the words of my wife, "This is going to rock her little world."
Or, in the words of my friend, "Hope's gonna be ticked."