Many subtitle files available online are poor translations or are out of sync with specific video files. This can ruin the timing of the scares. A "good" subtitle file translates not just the dialogue, but also the on-screen text (like the news ticker) and the frantic shouting that overlaps during chaotic scenes.
files are either 23.976 fps (Blu-ray) or 25 fps (European PAL). Ensure your subtitle file matches the source. Use VLC Media Player: Rec 2007 English Subtitles Download