Man of Honour
Atmosphere, unknown and sound. Only recent game that got my adrenaline running was SOMA
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edit- Also, I think it has to be said, most horror game fans will say RE1, where the 2 hounds jump through the window when your rushing towards an objective gave everyone the brown trouser treatment. Pretty defining moment in my gaming history.
Does anybody find enemies chasing you scary or suspenseful?
Dogs jumping through windows in L-shaped corridors.
How about the numerous unexpected moments in Resident Evil 3 when the Nemesis just busts out of a window or door and that music kicks in an he is chasing you shouting "Starssssss".Or lickers through interrogation room glass.