If the video was sent by a stranger or found in a "dark" corner of a forum, avoid it.
Internet culture frequently uses specific file names to create a sense of mystery or urgency. Why the Name? Public 957.mp4
A video that starts as one thing (e.g., a tutorial) but turns into a meme (e.g., Rickrolling). If the video was sent by a stranger
If you feel you must watch, keep your volume low to avoid hearing-damage pranks. Public 957.mp4
The lack of a descriptive title lures people into clicking.