It is a common naming convention for malware or "screamer" files (meant to jump-scare the user).
If you are engaging with this as part of an Alternate Reality Game (ARG) or a horror project: Lisa (25) mp4
Keep it vague. The most effective internet mysteries don't explain everything; they let the viewer's imagination fill in why "Lisa" is being recorded and what happened to the other 24 files. 4. Safety Warning It is a common naming convention for malware
Look for hidden text in the file properties (right-click > properties > details). Lisa (25) mp4
Use a low-resolution camera or a phone filter that mimics VHS or 90s camcorders.
Run the audio through a tool like Audacity to see if the visual waveform contains hidden images or messages.