Apologies for being really late.
Agor.io was a prank site for those who misspelled Agar.io in their browser's address bar. When the site was opened, an image of Jeff The Killer would appear which would rapidly change between negative and normal colors at a ratio that could cause convulsions along with a loud, almost metallic sound. When the user tried to close the page, a window would appear with the text "U SCARED BRO LOL" forcing the user to close the browser completely with Task Manager or do Ctrl+Alt+Del). Since August 2015, the site has been taken down.
