Manchester United legend Roy Keane has been back in the spotlight all week after releasing his second autobiography, his attempt to set the record straight on a whole host of issues including a bitter feud with Sir Alex Ferguson that shows no sign of ending anytime soon.
Keane is fairly scathing with his opinion of the former United boss and Ferguson is far from the only one to get both barrels, although there are plenty of lighter moments of note throughout The Second Half that deserve mention alongside the controversy.
Whether you like him or loathe him Keane's fierce commitment and passion drove United forward across a decade of Premier League dominance, but also quite often produced memorable of moments that definitely deserve a walk down memory lane.
The 43-year-old's own team-mates, managers and fans have never been safe from criticism on or off the pitch, and below we have five pieces of video evidence to prove it.
1. Revenge served in brutal fashion
Back in 2001 Keane proved he had a calculated streak to match his fiery temper after targeting Manchester City midfielder Alf-Inge Haaland, levelling his rival with a studs-high challenge that still has enough to venom to make you wince 13 years later.
Keane is at pains to insist in The Second Half that he didn't mean to deliberately injure Haaland, although he makes absolutely no apology for the awful tackle and insists he has no regrets about getting his own back on the ex-Leeds United star.
Haaland's career was shortlived after that tackle, but judge for yourself just how much malice Keane put behind it by clicking HERE.
2. World Cup nightmare
Leading the Republic of Ireland into the 2002 World Cup was supposed to the cherry on the top of a prolonged career at the highest level for Keane, but the adventure quickly turned into a nightmare that still divides opinion to this day.
Keane flew into a furious row with Ireland manager Mick McCarthy after heated exchanges regarding sub-standard training facilities at the team's camp in Saipan.
McCarthy sent Keane home after having aspect of his character questioned by his own skipper, in a whirlwind story you can recount by clicking HERE.
3. Southgate takes a kicking
It's almost hard to believe that Keane went more than two years without receiving a red card after signing for Man United, but boy did he make up for lost time when it did arrive.
Keane took his frustration out on a young Gareth Southgate with a double stamp after holding off a sliding challenge, with the fiery Corkman unable to keep the red mist away as he planted his studs into the defender's chest.
Check out the classic clip from the Premier League archive by clicking HERE.
4. Lights, Camera, Action
Keane set the wheels in motion for a premature United exit with a scathing attack on United's defeat at Middlesborough back in 2005, on the club's official television channel no less.
The criticism of his club colleagues was so scathing that Keane was fined and ultimately never forgiven for a perceived portrayal of his team-mates by Ferguson, with Darren Fletcher and Alan Smith in particular torn apart for their performance at the Riverside.
Ferguson got rid of his skipper just a few weeks later and still harbours a grudge over the incident, as he revealed in a video you can watch by clicking HERE.
5. Vieira and the Highbury tunnel
Keane's rivalry with Arsenal captain Patrick Vieira is the stuff of legend and may never be repeated, a box-office clash that summed up all the hatred and passion surrounding clashes between United and the Gunners for the best part of a decade.
That bad blood finally famously spilled over in the tunnel before United's 4-2 win over Arsenal at Highbury in 2005, with Keane moving to defend Gary Neville after Vieira threatened to make mincemeat of him in a pivotal title clash.
You can relieve that intense showdown, colourful language and all, by clicking HERE.