I get these very realistic robo-calls, where they have some kind of AI that responds to what you say, and seems very real at first. To test if they are real, I'll answer one of their questions, usually a yes/no question, with something like, "Banana split", and then it will say something like, "I understand how you feel", and then it will go on with the robot dialogue until the next question, and then I'll provide another ridiculous answer. It's actually kind of fun :)