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Tear Jerker: Kingdom Hearts coded
In coded, when Data-Roxas merges with Data-Sora. All his hurt memories start flooding into Sora, and we're quickly reminded of the sadness that was Days.
"I see a place. A sunset. Comforting...but also sad. This is where I spent my first...and my last...summer vacation. Rest easy...Your hurt can be mine now."
In the next scene, Data-Sora sees images of Naminé and Xion and can only manage to get out a "Something terrible happened, didn't it?"
On the subject of Days in coded, the opening of coded is a flashback of many different scenes from all the games chronologically before it. The scenes from Birth By Sleep, Kingdom Hearts, and Kingdom Hearts II are not obscured, except by the Matrix Raining Code. But when it gets to Days... we're shown maybe a full second of scenes, all flashing by fast and obscured by static. Because it wasforgotten.