*Titanic was sinking.*
Passenger: Hey, captain, how far away are we?
Captain: Two miles.
Passenger: Which way are we going?
Captain: Down.
Alright listen up, genius. The joke is that the Titanic is sinking. The passenger asks how far away they are, and the captain says "two miles." Then the passenger asks which way they are going, and the captain says "down," because the ship is sinking to the bottom of the ocean. You probably thought the ship was going to a fancy destination, but you are as wrong as thinking you are smart. News flash: you aren't.