The adventures of Sarah and Alex

Regarding an A/C switch on the car dash:
Alex: Hey what's this switch for?
Sarah: If you flick the little lever it'll automatically turn on.
Alex: Really?
Sarah: No! ::laughs::
Alex: Oh man, I'm so- Gallapagos!
Sarah: What?
Alex: You know, when you always believe everything someone says?
Sarah: ::Laughs:: You mean guillible! Gallapagos is in Greece!