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in the episode The Earworm Reverberation
Sheldon: Amy, there was a song I couldn't get out of my head. Eventually, I realized the song was about you, and like that earworm, I can't get you out of my heart. So, what I'm trying to say is, you're my heartworm. The metaphorical kind, not the poodle-killing kind.
This helps us figure out whether you are a human or a cyborg.