Diana Holmes: How did it do that?
Ianto Jones: It's automatic. It knows you're there.
Diana Holmes: But how?
Ianto Jones: There are wave-bouncing detectors which emit high-frequency radio waves and then they throw reflections -
[Diana examines the automatic doors than looks into the store]
Diana Holmes: Bananas...!
Ianto: Of course bananas are far more interesting.

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