Small Scary Flash
From Screamer Wiki
Small scary flash is a flash screamer. It shows a extremely small picture of clouds but after a while it shows a picture of a skull along with a weird scream. The website is deactivated so it must be accessed over Web Archive servers.
The following website contains a screamer:
web.archive.org/web/20050408072534/members.lycos.co.uk/martyncruise/scare.html