Few transfers have shaken English football to its very core quite like Sol Campbell's switch from Tottenham to Arsenal back in the summer of 2001.
Making the move between the two North London clubs is widely regarded as a no-go, purely due to the level of ill-feeling between the two, but it didn't seem to phase Campbell too much.
Enticed by the bright lights of Highbury and the talk of titles with then-boss Arsene Wenger, the England ace stunned the sport when he emerged at Arsenal's training ground to an audience of stunned reporters. While it was all smiles among the Gunners fanbase, the fury from Tottenham supporters is still felt more than two decades later.