1x02 "The One with the Sonogram at the End"

Carol, Ross' lesbian ex-wife, tells him at work that she is pregnant with his child and, when he attends the sonogram, is stunned to learn that she wants to give the baby her and her lesbian lover's last names. Monica nearly has a breakdown from stressing when her and Ross' parents come for dinner. Ross and Rachel console each other, as she has to return her engagement ring to Barry and finds out that he and her maid of honor Mindy, went on her honeymoon.