Heartwarming / Prince of Persia: The Sands of Time
The very fact that those who have died on this whole adventure (the ones we like at least) are alive now that the reset button was hit.
The scene with the young Dastan protecting Bis from the guard who tried to beat him within an inch of his life.
Dastan faces Tus (who is convinced that Dastan conspires to take the throne) and explains the power of the Dagger of Time, then kills himself with it, trusting that Tus will believe him and use the Dagger to undo his death. He does.
After Dastan says that he looks forward to the day that they know each other better, he extends his hand out to her, and you can see Tamina smiling as she takes his hand. This shows that she's already warming up to Dastan.