QTEs, or Quick Time Events, are a way for video games to let the player feel like they're interacting during a mostly cinematic sequence.
They're slightly controversial, because many argue they're barely "gaming" at all; you're just pressing some buttons while the real action takes place solely on the screen.
There's no controversy about this QTE, though, found at the end of Ace Combat: Assault Horizon. It's just... awesome.
Best QTE Ever - Ace Combat: Assault Horizon [Giant Bomb]