Smirk: This is a funny one, smirking is when someone displays two different emotions on their face, the zygomatic muscles on, lets say the right side of the face for this example, will pull the right side cheek and lip upwards…but the right side of the brain controls the left side of the face and will have the opposite effect of pulling downwards on those same muscles of the other side, giving a smile/frown contradiction effect. This type of smile displays sarcasm. Font: http://sapientology.com/tag/types-of-smiles/