Suppose a beggar asks you for 5 quid in return for saving the lives of billions in a Universe he controls. You demur. He then shows you that he is a Matrix Lord and does in fact control such a Universe and only asked your for a fiver because he is running an experiment in behavioral Econ re evidential decision theory.
This is the 'not even wrong' scenario described by Elizier Yudkowsky over at Lesswrong.
My response is-