Mostly, of course, my response is that I feel confused; therefore, I deny that this event ever actually happened.

But if you're being honest and telling the truth as you know it and you remember accurately, then the next step is to consult a stage magician, not math grad students or a physicist or a theologian.

Same goes for anyone in the audience who's witnessed a bended spoon, an improbably guessed sequence of cards, etc.