[[caption-width-right:250: Admit it. [[ManlyTears You shed tears of joy at that moment too.]]]]
* The ending of the game, when Luigi has finally gotten Mario's painting back after a horrifying night. The Prof. decides to use his machine in reverse, sending Mario through a ridiculous course with much comedic hollering. What makes this a CrowningMomentOfHeartwarming, however, is Luigi's reaction when Mario bursts out the other end of the machine, fully alive, but with a grate stuck over his head. Luigi opens his mouth in a wide smile, like he can't believe it, cries just a little bit, and lets loose a most heavily relieved laugh. ItMakesSenseInContext, and when you've gone through the events Luigi has, overcoming his fear for his brother... That one moment makes it all worthwhile.
* VisualGag. The ballroom dancer ghosts have the same heart. They share a heart!
* Cheering up the various crying Toads throughout the mansion. [[MostWonderfulSound The uplifting little jingle]] that plays when they turn the lights on for you helps as well.
--> '''Toad''': Thanks, Luigi! You made my dark and stormy night!
* King Boo of all people gets one. When speaking to Luigi right before his fight, he calls his fellow Boos his "friends". Not minions. Not allies. Friends.