Super Mario Bros. 2
"Sent in" by Jesse Smith
If you go through the whole game with out playing as Luigi, after you kill
Wart, you will see Luigi. He won't be very happy. He says "Because you
didn't let me help you in your adventure to destroy Wart, later when
you need my help, I won't be there to help you. You are on your own
from now on." Then you view the credits. After the credits, you wake up
screaming like you had a nightmare. You go to Luigi's bed room to see
if he is there. He is gone and you never see him again.