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in the episode The Geology Methodology
Raj: Hey, uh, who's free tonight?
Leonard: Oh, I think I'm-
Sheldon: Hang on. We've made this mistake before. It's how we wound up at his cousin Deepak's Tupperware party.
Raj: Hey, you use that collapsible bowl all the time, and you know it.
This helps us figure out whether you are a human or a cyborg.