This is an old Internet parlor trick (six cards appear; you select one; the computer shows you five cards with your selection missing), but it’s worth checking out again:
Oh, I don’t mean that it’s incredible or “psychic”… just that you ought to read the comments that the guy has received from people offering their explanation on how it works. To wit:
From Tara R.
Quantum mechanics may permit synchronicity of thought and computer software. I suggest that, on the quantum level, you were able to predict the card I selected even before I selected it. It is also possible that my brainwaves may influence your software. Although this seems far-fetched, we know that brainwaves are detectable with SQUID (superconducting quantum interference devices.)