Luigi had just finished lunch, and was heading back to his dorm room. He was about to reach for the doorknob and open the door to his room, when he noticed a familiar figure dressed in red standing not that far down the hall. Luigi turned to get a better look at the man, and recognized those overalls. "...Mario...?" He approached his brother.
As Luigi got closer to Mario, his brother began to speak to him, his back still facing him. "You bet, Luigi! It'sa me, Mario!" Luigi smiled. "Bro! What are you doing back at the academy?" Mario turned to face Luigi, and Luigi's smile began to fade into a look of horror. "I'm just coming back to get my revenge on you, Luigi..." Luigi now noticed that Mario had a crown on top of his red hat, and that his face... his face... was King Boo's face. King Boo grinned, showing his large, sharp, Boo teeth, as he strolled down the hall, getting closer and closer to Luigi.
Luigi turned and tried to run, but he couldn't. He was trapped. Luigi realized what was keeping him from escaping- a very familiar picture frame. King Boo stopped in front of the portrait, smiling, watching Luigi frantically slam his fists on the glass of the picture frame. "Have fun living the rest of your short life as a portrait, Luigi. Now I can finally have you," He leaned on the wall next to the picture frame, before motioning to himself. "And your brother."
[In reality, Luigi stopped with his hand on the doorknob to his dorm room, ran down the hall yelling his brother's name, then stopped, looking as if he'd seen death itself, before turning and running straight into a wall. He's now crying and screaming, slamming his fists into the wall.]