lidanude.jpg is a Flash screamer, similar to Jessica Alba Naked. When the webpage is opened, part of a picture of a nude girl lying on a bed is shown, without showing the whole picture because an effect is applied to trick the user into thinking the image is being loaded. A short time before the whole image is shown, a flurry of well-known screamer faces appear, one of them being Pazuzu; the slideshow is accompanied by a loud scream. Right after the screamer part has finished, a line of text appears saying April Fools!
NOTE: The following website contains a screamer.