South African teenager Reggie Erasmus was kicked out of the UK because he couldn't remember when his sister was born.
Reggie said passport control officers at the arrival counter became suspicious of his reasons for entering the country when he could not remember his sister's birth date. He was taken to a back room where spent the next 12 hours.I guess they won't let me into the UK either, because I have no clue when Reggie's sister was born.
"The lady would hammer me with questions and then leave for an hour before coming back again. I was given documents stating that because I didn't have enough money to support my stay, they were deporting me." [Link]