Déjà vu is more than just that fleeting moment of surprise, instantly forgotten because we never bother with things that make no sense. It show that time doesn't pass. It's a leap into something we have already experienced and that is being repeated.
If you confront anyone who has lied with the truth, he will usually admit it - often out of sheer surprise. It is only necessary to guess right to produce your effect.
Cupid is a casuist, a mystic, and a cabalist,-- Can your lurking thought surprise, And interpret your device, . . . . All things wait for and divine him,-- How shall I dare to malign him?