If you properly shuffle a deck of cards, in all likelihood, the resulting deck has never been seen before in the history of the world.

Details:

There are approximately  8∗1067$8\ast {10}^{67}$ permutations of a deck of 52 cards (52!). The modern deck of cards as we know it was invented in 1480. There are approximately 1.6∗1010$1.6\ast {10}^{10}$ seconds between now and then. In order for there to even be a 0.001% chance of a random shuffle to have been seen before, the world would have needed to have generated  8∗1062$8\ast {10}^{62}$ shuffles to date or approximately 5∗1052$5\ast {10}^{52}$ shuffles per second. Not even Vegas can shuffle that fast.