From Wonderwall: Robert Pattinson is a good-looking guy -- there's no doubt about it. That's probably why we enjoy his ridiculous faces so much. Maybe he's overcompensating for K-Stew's lack of expression, but whatever the reason, we're trying to figure out what he's thinking. So in honor of the "Twilight" star's birthday on May 13, join us in a psychological exploration of his innermost thoughts.