Penny: You're a grown man. Haven't you ever been sick before?
Sheldon Cooper: Of course. Just not by myself.
Penny: Really? Never?
Sheldon Cooper: Well, when I was fifteen I was at the Heidelberg Institute in Germany.
Penny: Studying abroad?
Sheldon Cooper: No, visiting professor. Anyway, the local cuisine was a little more sausage-based than I'm used to, and the result was an internal blitzkrieg, with my lower intestine playing the part of Czechoslovakia.
- The Big Bang Theory (s01e11 The Pancake Batter Anomaly)
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