Ellis Grey (Kate Burton), who is suffering from Alzheimer's, shocks her daughter when she starts talking about her active sex life. TMI for any daughter, right? Meredith is even more surprised when she discovers Ellis once had an affair. Little does she know it was with one Richard Webber. Watch this funny Grey's Anatomy scene from Season 2, Episode 18: Yesterday. And don't miss all-new episodes THURSDAYS 8|7c!