Tony Bellew clearly remembers the moment when he was hit so tough that, like a donkey, his hind leg kicked involuntarily.
The former cruiserweight world champion has faced quite a few heavyweights throughout his storied career, including the likes of Adonis Stevenson and Illunga Makabu.
But it was David Haye, perhaps most importantly, who posed a particularly formidable challenge ahead of their first heavyweight clash in 2017.
As it turned out, “Hayemaker” at that point was a far cry from the once-explosive sharpshooter who had unified the cruiserweight division nearly a decade earlier when Bellew won by stoppage in the 11th round.
Haye was, of course, getting closer to retirement, and with a long list of injuries that didn’t exactly assist matters, the Londoner also suffered a second loss to Bellew in 2018.
Instead, in 2005, Bellew felt the full power of Haye, so powerful that even gloves and headgear during sparring provided minimal protection.
At the time, Haye was preparing for a British cruiserweight title fight against Mark Hobson, but a hamstring injury ultimately sidelined their bout.
But even with the injury, about two weeks before the scheduled competition, Haye was determined to play with Olympic bronze medalist David Price.
Then, after arriving in Liverpool, the then 24-year-old discovered that not only would he spar with Price, but he would also share a few rounds with Bellew, who had just won the English Championship as an amateur.
I’m talking to Lock&TBellew candidly describes what happened during the closed-door celebrations.
“Despite this, to this day it is the hardest blow I have ever received.
“I went out and just did it [adopted a high guard]like a stupid fool. He just put his hand on my face.
“Like an idiot, I tried to look around [his left hand]and before I knew it [what was happening]that uppercut went through the middle and hit me on the chin.
“My head and my back leg just went up [kicked out]for no reason. I told him, “Good shot,” and he looked at me as if to say, “You should be on the floor.”
Of his 28 career wins, Haye finished 26 by knockout. He is one of only three men, along with Evander Holyfield and Oleksandr Usyk, to unify the cruiserweight division before winning the world heavyweight title.