Fright Gauge

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Fright Gauge is a screamer animation hosted at haunted.org in 2005, The animation starts with the following message:

"'Find the Fiend Gauge (patent pending) is designed to measure your visual activity. Studies have shown that sight plays a major role in our ability to sense the weird, strange, and supernatural. People with higher-than-average perception skills, studies show, are more likely to notice paranormal phenomena. To test your visual activity, see if you can spot the ghost hiding in one of these windows…'"

The text fades, and a zombie with a scream appears about 8 or 9 seconds into the "Fiend Gauge." Then some text will appear that reads "did you see it?" and a button will appear that allows you to replay the prank.

Link
NOTE : the following animation contains a screamer!
 * web.archive.org/web/20051013061802/haunted.org/html/fright_gauge.html
 * Archived SWF file: web.archive.org/web/20051013061802oe_/haunted.org/flash/guage.swf