On the third episode of Louis C.K.'s hilarious new FX show, "Louie," we get an extra special treat. Ricky Gervais makes an appearance as Louie's old high school friend-turned-doctor and brings his unique brand of humor along with him. When Louie comes in to see why he's been feeling under the weather, Gervais' character unleashes a world of awkward pain on his old friend. Exclaiming "You don't need a doctor, you need a time machine!" after Louie removes his clothes is just a warm-up for what he really has planned: a full rectal examination.