Gone waaaay too soon. Sigh. I simply couldn't choose between these two geniuses; thus, they share the birthday spotlight.
Jim Henson: 75
http://www.youtube.com/watch?v=Xn49H3O0Jvk&feature=related
Phil Hartman: 63
http://www.youtube.com/watch?v=gMnG3gOqigE