Chiron: Use this to defend yourself. It's a powerful weapon.
Percy Jackson: This is a pen.
Chiron: Only use it in times of severe distress.
Percy Jackson: This is a *pen*.
When Luke is playing video games in the camp he is using a Playstation controller, however when he pauses the game it quite shows a message telling him to push the 'A' button. 'A' buttons appear on Xbox games consoles rather than Playstations.