8 perfect Faro shuffles in a row will return a deck of cards to the original order. I am curious as to whether anyone has actually performed this feat. I found a Youtube video, but does anyone have any more definite proof of whether this feat has been accomplished?
Quite a few more than eight actually:
British magician David Willmott completed 2,784 ‘Faro’ shuffles at Illusions Magic Bar in Bristol - setting the new world record for the most complete perfect Faro shuffle cycles in 12 hours.
Source: World Records Academy
In short Yes! I recommend the book Magic Tricks, Card Shuffling, and Dynamic Computer Memories by Ivars Peterson where he explains how to do it, and the maths (if you are interested, as a skeptic ;) behind it).