The swarmers attack in the original #Homeworld was, for 12-year-old me, a moment of awakening. The "I am so scared and this is so cool" feeling remains one of my defining experiences of interacting with media.
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Same sort of feeling with the Turanic Raiders attack: https://youtu.be/dTKakINXjl8
You see these beautiful, terrifying ships sweeping in toward you, the music swells, they're getting closer, and the *game will not give you control* until the last second. It was breathaking.