A sneeze is a very dynamic facial expression involving nearly all of the facial muscles - animating one is good general practice.
The BlenderHead Sneezes (http://www.visiontovision.com/BlenderHeadSneeze1.html)
The complete 18 part video tutorial can be accessed here:
The Blender Head for The Blenderhead (http://www.visiontovision.com/BlenderHeadIntro.htm)
I hope you have enjoyed the series,