A quick peek at our run-down of football's worst tackles is enough for most to recoil in horror - well, unless your name's Harald Schumacher, that is...
Roy Keane on Alf-Inge Haaland, Manchester derby, 2001
The roots of this infamous knee-high tackle were bedded three years previously.
A mistimed Keane lunge at Leeds' Haaland resulted in a cruciate ligament injury for the United skipper - an injury to which the incensed Haaland was, unsurprisingly, less than sympathetic.
The Norwegian stood over Keane's prone figure and denounced him (somewhat vociferously) as a faker.
Shockingly, Keane held a slight grudge about these actions, and in the 2001 Manchester derby Keane saw (or, rather, plotted) an opportunity for revenge, ensuring this 50-50 ball had similar odds of now City star Haaland being able to walk again.
A red card, five-game suspension and £150,000 fine followed, but hardly seemed a fitting punishment after the level of pre-meditation was revealed in Keane's autobiography.