http://www.youtube.com/watch?v=DSW86EFENBg
Composing functions is just like making this!
http://www.zimbio.com/watch/waLURLED4Hp/Napoleon+Dynamite+Scene+Liger/Napoleon+Dynamite
http://www.youtube.com/watch?v=S4AEZElTPDo
http://www.purplemath.com/modules/fcncomp5.htm