I talk about the use of additive & dynamic layered animation. Use it!
(Sorry for the weird quality / lag / it looking like I shot this with a potato. My machine crapped out, but I didn't want it to hold up making a video.)
__Useful links to understand more__
Animation tweaks: http://www.youtube.com/watch?v=TL4KowwASR4
Keith Lango on using layered animation in character process: http://www.keithlango.com/tutorials/old/popThru/popThru.html
Let me know if you have any questions & thanks for watching!