You got a sound you enjoy hearing in a video game? Be it either the sound of a weapon, or simply your characters footsteps, feel free to post yours in the comments.
Personally I've always enjoyed the countdown timer of Halo Multiplayer when starting a game or respawning.
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Dark souls 3 main menu theme. The archon priest talking in destiny. The escape from earth song playing in mass effect three. Halo 4 main menu theme. The old theme song for the bungie logo in halo 2. Just a couple favorites.