After having a mental breakdown, Ross then finds out that his best friend, Chandler, is sleeping with his little sister, Monica. He finds out while his old boss is checking on him to see if he is stable enough to come back to work. Talk about bad timing. I'm not sure what's funnier — Phoebe's reaction and then trying to hide it from Ross or Ross's reaction. Or when Phoebe and Chandler try to fake seduce each other to see who will make the other crack first.
Best quotes: "Chandler and Monica! Chandler and Monica! My eyes! My eyes!"
"I know, and Joey knows, but Ross doesn't know, so you have to stop screaming!"
"Oh my God. He wants me to come over and feel his bicep and more!"
"No! No! What are you doing? Get off my sister!"