h2g2 The Hitchhiker's Guide to the Galaxy: Earth Edition

....disgust - wrinkled nose, raised top lip. It is the same all over the world, though the things which disgust are different. A smile is also a universal gesture, everyone knows what a smile is, and even of you are faking it (there are muscles around the eyes, very hard to control, that kick in if you really smile The face made if angry is also universal, as is sadness. I think fear is also another. All over the world these are the same, though what causes them may be different Until later....
BCNU - Crescent

I would agree with these.

I think the most interesting non-universal gestures are those that mean "yes" and "no." If you wander too far off the beaten path, you will find that some cultures shake their head for "yes" and nod for "no." Confusing!

A tangent on the real smile thing:
A real smile will fade after a few seconds. Forced or fake smiles will last much longer.

Also, a real smile will move more muscles on one side of the face (the right side, I think), whereas a fake smile will move more muscles on the other. This is because of the relationship between the emotional centre of the brain and the muscles that get used for smiling. Smiles are seldom perfectly symmetrical.