Quote from Georgie in the episode A Tire Convention and the Moral High Ground
Georgie: I can't wait to meet the Hankook tire guys. Jim: Mm-hmm. Georgie: I learned how to say "hi" in Korean. Annyeong. Jim: How'd you learn that? Georgie: Called Sheldon. He also taught me, hwajangsil-eun eodie. Jim: What's that mean? Georgie: Where's the bathroom? Jim: Why does your brother know Korean? Georgie: Why does he know Klingon? I've learned not to ask.