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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Reloading wonder weapons "Last lap" in Mario Kart Menu button presses in SOCOM (except the loadout selection which was harsh and disagreeable) The tracking noise on the loading screens in Battlefront 1 And I haven't even played Metal Gear and I know the "spotted" sound.