Manchester City's £17million new signing Aleksandar Kolarov has a reputation for his thunderous shots - just ask an Italian referee and his former Lazio team-mates.
Referee Massimiliano Saccani was knocked out for several minutes in February 2009 by one of the player's strikes during a match against Torino.
Nine months later it was the turn of Ezequiel Lavazzi of Napoli, who also suffered the same fate.
Kolarov managed to break three fingers of team-mate Sebastiano Siviglia after unleashing another power drive. Because of his powerful strike, his nickname at Lazio was Roberto Carlos.