The video exploits the human startle response. By forcing the viewer to lean in and turn up the volume to "hear" the quiet intro, the creator ensures a maximum physiological reaction when the "screamer" eventually hits.
Today, valentine02.mpg is mostly discussed in online forums and "internet iceberg" videos as a nostalgic piece of early web history. valentine02.mpg
These files were usually small enough to be sent as email attachments, which helped the prank spread "virally" before social media existed. The video exploits the human startle response
The .mpg extension (MPEG-1 or MPEG-2) was the standard for high-quality video before the rise of MP4. valentine02.mpg