Trex.swf

T-Rex.swf
T-Rex.swf is a screamer made by kebabfrites, creator of Pumba.swf. When clicked on, the page displays a picture of a Tyrannosaurus Rex with its mouth fully open and displaying its large, sharp teeth while accompanied by a distorted, mechanical animal roar. Every four seconds, the page refreshes itself.

Link
NOTE : The following website contains a screamer.
 * image.noelshack.comm.free.fr/fichiers/2013/77/trex.swf