I don't even know where to begin: the fact that this artist is incredibly talented or delightfully demented.
Swedish makeup artist Sandra Holmbom painted this incredibly realistic eyeball on her lips. Sure, it just looks interesting with her lips closed, but nothing says "Aaaaaaaaahhh!" like seeing teeth come out from the center of an eyeball.
Rather than creating eerie and grotesque makeups with prosthetics, Sandra has an uncanny ability to make photorealistic images on the skin all with some paint. Other favorites of mine include her clowns, her eyeball-by-the-nose, and her horse. But nothing beats that fucked-up eyeball-mouth.