Quote from Sheldon in the episode The Grand Chancellor and a Den of Sin
Mary: [prays] Please watch over Missy and Sheldon and especially Georgie. And please don't let my failings as a mother get in the way of Your plans for their lives. Amen. [gasps] Hey, baby. What's wrong? Sheldon: Is it that obvious? Mary: Well, you are outside, where birds live. Sheldon: True. I'll make it quick. I'm experiencing what the Germans call weltschmerz. Mary: Uh-huh. And what do Americans call it? Sheldon: The pain of the world. Mary: Sounds more fun in German. Sheldon: Most things do.