One of the most famous New York City taxi drivers Oleg Roitman, a.k.a. The Human-Computer.
If you tell me any date (month, day, year), for example, the date of your birth - in less than a second I will tell you on which day of the week you were born (Monday, Tuesday, etc.). I calculate in my head extremely quickly - yes, yes, I am a genius!.
I have been featured in the New York Times, ABC television and on NPR radio. These and other media appearances are available on my website at www.the-human-computer.us