The ending of "Great Guns", where Oswald is revived and reunited with his girlfriend, who was working as a nurse in the army.
For everyone who is still feeling sad about Oswald's inevitable "woobie" status, just look at this statue done by Sideshow entitled True Originals◊ All together now: D'awww!
Walt Disney was out played by Universal Studio, and took his creation from him, forcing Walt to make his own studio. After appearing in only a handful of shorts, Oswald was left to be unused, unloved, and forgotten for decades. In 2006, Disney traded it's sportscaster Al Michaels, a real human being, in exchange for the rights to Oswald. And then pulling out all the stops for the ensuing reboot.
Even better? Al Michaels has said that getting Oswald back was the more important step and that Disney got the better deal.
He also compared it to a contemporary trade between two football teams:
"Oswald is definitely worth more than a fourth-round draft choice. I'm going to be a trivia answer someday."
According to Walt Disney's daughter, Diane Disney Miller, Bob Iger told her he wanted Oswald back in Disney's IP shortly after becoming CEO. Her official statement acknowledged him as a man of his word.