The best way to portray amused superiority or superior amusement, the arched eyebrow is a prime weapon in the expression arsenal for the Chessmaster, Manipulative Bastard or (in possibly the most famous modern example, hence the trope name) The Spock. Often raised just as the heroes comprehend what the Evil Plan was all about. For instance, finding out that by foiling one objective they helped their enemy achieve a second, the planner will arched an eyebrow as if to say 'suckers!'. Combine this with Twinkle Smile, and you get the Dreamworks Face.