Roy Keane almost considered retirement after being sent off for Manchester United in an ebullient Premier League clash against Newcastle in September 2001.
With United trailing 4-3 at St. James' Park, a visibly frustrated Keane tried to provoke a reaction from Alan Shearer and deliberately hit him in the head while pretending to take a throw-in.
However, he only succeeded in getting himself booked by referee Steve Bennett, before losing his temper as the former England international goaded him.
Bennett swiftly upgraded the yellow card to a red as Keane threw a punch at Shearer but missed and ended up shoving the Newcastle number nine, while being restrained by David Beckham.