Then see for yourself.
A clever anatomy tool that lets you play with various facial expressions, seeing how muscles and whatnot react (that’s the technical phraseology, I believe). Who knows what you might accomplish if you actually knew what you were doing, kind of.
How to get there:
Click on APPLICATION, then on LEVEL II (if you can handle it).
Take it from there.
P.S. This particular face expresses doubt, in case you were wondering.
(handily via WFMU)