Though Ross has a hilarious allergic reaction and visit to the doctor I absolutely love Chandler and Joey in this episode.
Joey: Hi, here's the deal. We lost a carseat on a bus today. It's white plastic, with a handle, and it fits onto a stroller. Oh, and there was a baby in it. Joey: All right... ducks are heads, because ducks... have heads.
Chandler: What kind of scary-ass clowns came to your birthday?