"Detective Spooner: What makes your robots so perfect?! What makes them so much...goddamn better than human beings?! Dr. Susan Calvin: Well, they're not irrational or...potentially homicidal maniacs for starters! Detective Del Spooner: [sarcastically] That is true. They are definitely rational. Dr. Susan Calvin: You are the dumbest dumb person I've ever met. Detective Del Spooner: Or is it because they're cold... and emotionless, and they don't feel anything? Dr. Susan Calvin: It's because they're safe. It's because they can't hurt you!"