On February 28, 2008, Pakistan Telecom started announcing a prefix 208.65.153.0/24. This prefix is larger than 208.65.152.0/22 usually announced by YouTube. The BGP routers in the internet that received the /24 prefix preferred it over the /22 announcement and started using it. Internet traffic originally going to Youtube started flowing toward Pakistan Telecom. You can find detailed information about this event on the RIPE NCC pages or you can watch the following video analyzing the event with the BGPlay tool.