This clip runs about 3.3 seconds, so it is compact enough for quick scares without aggressive trimming. Download the MP3 to keep a local copy and trigger it offline from your device or soundboard. You can assign it as a ringtone or notification tone if your phone accepts custom audio files. Its eerie detail can get buried beneath loud dialogue or game audio, so lower competing tracks during playback. For a longer doorway setup, place a door knocking sound shortly before it, leaving a brief pause between them.