[video=youtube;o_IiviALdzY]http://www.youtube.com/watch?v=o_IiviALdzY
What makes me laugh is the fact that IF Sega finds this vid, they'll get Youtube to destroy his account.
http://www.tssznews.com/2010/02/16/sega-already-on-damage-control-after-sonic-4-alpha-leak/
Head to the link above for more info!