Magic 8 Ball
My dad went to Florida recently. He was there when the hurricane hit. Apparently it was very scary, but they were all OK. As a souvenir he brought me back an authentic "Magic 8 Ball". You ask it a question, turn it over and the "answer" appears in a blue window. My daughter has one as well.
We thought about asking them both the same question and seeing if they agree. I reckon there is a nice science fiction short story there about two balls that did agree, but I'm not sure how you would end it.
I'm going to take my ball to work and keep it in the office. I can kid the students that I use it for marking project reports....