Of course “The Body”, but some others I really liked are “Normal Again”, which was supremely unnerving, and “Selfless”, which started a total laugh riot and went into the final commercial break with a scene that made your blood run cold.
There’s about 10 or so episodes that legitimately make me tear up. I love that show. I’ve seen the whole thing through about 20 times. It makes me feel like I have friends.