It is a common "troll" file shared in group chats to startle friends.

When posting or sharing such files, be aware that many platforms have Safety Rules regarding "flash" content or extreme loud noises that could be considered harassment or harmful to users with certain sensitivities.

The "BB" in the filename often hints at a suggestive or dance-related video (e.g., "Big Booty"), luring unsuspecting viewers into opening it.

If you are looking to create a post about this phenomenon, here are a few directions: