Yes! I don't if there's a name for it, but that's a technique for vetting potential frauds -- ask them to do something impossible and see their reaction. It's a

Yes! I don't if there's a name for it, but that's a technique for vetting potential frauds -- ask them to do something impossible and see their reaction. It's arguably what the British MP was doing when he asked Charles Babbage if the Difference Engine would still give the right answers when you put the wrong numbers in.