The Ballad of Cripple Kane
Because of the vcam, tweening, and gigantic amount of sloppy layers, this animation always chugged in an swf player. I've neer even seen it run smoothly myself... until now!
Special thanks to Mindchamber for putting the video through after effects and giving it a nice old-film look.
link to original: http://www.newgrounds.com/portal/view/501313