6x23 "The One with the Ring"

Chandler and Phoebe go looking for an engagement ring, and Chandler finds the perfect one but does not have the money with him to purchase it. When he gets his hands on the cash and returns to the store, he is dismayed to find Phoebe allowed the ring to be sold, so he tries to track it down. Meanwhile, Rachel attempts to get Paul to open up emotionally but does too good a job when Paul starts crying and won't stop. Joey and Ross are upset that it appears that Chandler prefers to spend time with Phoebe, so they decide to close Chandler out