Emails are down for the screamer forums. However, if you don't appear to be an offsite raider or brigader, your account has been approved.
Shock.swf
mit.edu/activities/puzzle/2010/puzzles/2009/the_zyzzlvarian_holovid_institute/shock.swf is a screamer webpage. It shows a text that says "Wait for it.." and after some seconds, a flurry of pictures, including Regan MacNeil from The Exorcist, but also some none-scary ones. After that, a message appears, saying "Boo! Did i scare you?"