4. Sol Campbell
Since 1977, only one player, Sol Campbell apparently, has dared to switch sides between Tottenham and Arsenal directly. He made 315 appearances for Tottenham and also stated in an interview that he would never like to play for their arch-rivals.
However, with the dawn of 2001, as he inched closer to the expiry date of his contract with Tottenham, the club offered him a new deal which would make the Englishman the highest-paid player at the White Hart Lane.
Campbell, however, spurned their advances and tracked back on his views about playing for Arsenal. He joined the Gunners and won a domestic double of Premier League and the FA Cup in the same season he signed for them.
Adding to the icing on the cake, he also lived the finest moments of his career being a part of the Invincibles squad that won the golden Premier League trophy for remaining unbeaten throughout the entire 2003-04 season.