Often used trope, usually as a plot device motivating the protagonist to learn the "truth"about themselves, but sometimes also used to in plot twists and rewriting origins. If it's not used in the beginning it will be dramatic, grand reveal, all with the appropriate music.
|2011||Kung Fu Panda 2: The Kaboom of Doom|
|2011||Jumping the Broom|
|2011||Madea's Big Happy Family|
|2010||Percy Jackson & the Olympians: The Lightning Thief|
|2008||Baby and I|
|1980||Star Wars: Episode V - The Empire Strikes Back|