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in the episode The Positive Negative Reaction
Leonard: I'm not seeing anyone using liquid helium vortices like this.
Howard: I'm not finding anything either.
Raj: That's a good sign.
Sheldon: Oh, wait, I found something.
Howard: Damn. What is it?
Sheldon: This video. The baby panda sneezes, and the mama panda gets so scared.
This helps us figure out whether you are a human or a cyborg.