Mike Tyson's punching power was every opponent's worst nightmare in the prime of his career.
The man KO'd 44 people down the years, including Trevor Berbick, Larry Holmes and Michael Spinks, among others.
Tyson's explosive power rightfully earned him the nickname 'The Baddest Man on the Planet' and 13 years after retiring from professional boxing, the 53-year-old is still punching hard.
In the below footage, the former undisputed world heavyweight champion is seen smashing the heavy bag with tremendous force.
On his 53rd birthday, Iron Mike still has incredible power, reminiscent of his glory days in the ring.
Tyson had a 'win at all costs' reputation inside the boxing ring.
The controversial figure may be known as the youngest boxer to win the WBC, WBA and IBF heavyweight titles, but perhaps his most infamous moment involves biting a chunk out of Evander Holyfield's ear.
Years after his retirement from the ring, Tyson got a tribal tattoo inked on the left side of his head.
Originally, however, the boxer wanted something different to be permanently inked onto his temple and cheek.
Talking in an interview on In Depth with Graham Bensinger, he revealed that he wanted his face to be covered in heart tattoos, simply because he thought it was cool and that he'd then be recognised as 'The Man of Hearts'.
The tattoo artist then advised Tyson against this.
According to the man himself in his 2008 documentary Tyson, the tattoo represents his 'warrior status'.
It's similar to the ones that members of the Māori tribe, a warrior-like tribe in New Zealand, wore to scare people in battle.
Not that he needed anything more to make him scary.
He also got it because he thought the design was 'cool': "I thought it was so hot. I just thought it was a cool tattoo."
Mike Tyson hasn't lost his punching power, that's for sure.
Happy Birthday to one of the greatest of all time.