One of things Friends did best was the Holy Shit moment - things you didn't see coming, when the whole studio audience gasped. "Do you think he knew I was here", Monica popping up from under the covers in Chandler's hotel bed. "I got off the plane", Rachel showing up at Ross' door. "Oh my God", Ross is the father. "You wanted it to be a surprise," when Chandler thought Monica had gone to her parents' house.