"Yes, there are, though I'm not sure this is necessarily a real one. It's more likely to be something they just made up for one day just to see what you'd do with it."
He purses his lips. "And yes, it's their idea of fun. At least - they pretend it's all educational, for their research and our own insight into ourselves, but most of the time I'm pretty sure they're just laughing themselves silly watching us try to deal with what they throw at us."