Stoic in victory. Irascible in defeat. Quite possibly the loneliest man in the world when photographed stewing in his own bitter thoughts.
Roy Keane is essentially football's answer to Tommy Lee Jones, a man who'd eat his own beard in a fit of anger if he could. His 50 yard death stare would reduce most men to quivering mounds of goo. And punditry hasn't exactly mellowed the former Irish midfield enforcer. Far from it: the elder statesman TV role has merely handed him licence to speak ill of people, settle old scores, make new ones, and, naturally, get paid for the pleasure.
Speaking in his weekly column for The Mail on Sunday this weekend, Keane set his sights on the current Arsenal team, claiming they'll never amount to much as they're too interested in 'selfies' and 'six-packs' to win the league. Yes, the same team who a few hours later went on to beat Chelsea and lift the Community Shield at Wembley.
And if you thought he was brutally forthright in his assessment of Arsene Wenger's team, here are 10 other occasions when the Irishman didn't take any prisoners.