This is the only scene in all of the I Love Lucy series in which Desi and Lucy shy/turn away from the camera; they were both genuinely crying and it wasn't scripted. The episode is called "Lucy is Enceinte" (Lucy is Expecting). This is the scene where Lucy tells Ricky she's pregnant; Lucy was pregnant in real life as well, and that's why it was such an emotional scene for them. My favorite I Love Lucy moment. Click on it to see it pan out!
”He would sit with me and cry. He would actually cry sometimes. Talking about how much he loved her,and how terrible it was that they were divorced and he loved her to his dying day.” - Marcella Rabwin