Mike Tyson and Jake Paul have officially weighed in before their highly anticipated boxing match, but it's the slap heard around the world that has everyone talking.

The 58-year-old Tyson, once the undisputed heavyweight champion of the world from 1987-1990, weighed in at 228.4 pounds. The 27-year-old Paul, a social media star who's won 10 of 11 professional boxing matches, weighed in at 227.2 pounds.

During their staredown, Tyson quickly slapped Paul, setting off a horde of people pulling the ex-champ back and separating the two.

Combat sports journalist Ariel Helwani tried to get word with both fighters afterward (25-second mark).

All Tyson said was "the talk is over" before walking off stage. Helwani soon gave his first-hand insight.

Paul did a little meditation as Tyson was being pulled away.

However, Paul did take great offense to the slap. He said it didn't physically affect him but that the fight was personal, to the point where he screamed that Tyson "must die" now in the ring.

Paul also changed his Instagram profile picture to that of comedian Chris Rock being slapped by actor Will Smith at the Oscars in 2022.

Paul also added this remark.

Post weigh-in and slap, fans and analysts offered their reactions to Tyson vs. Paul, which was the last major event for the fighters this week before they face off Friday.

Thursday's weigh-in took place at Toyota Music Factory in Irving, Texas. It also featured weigh-ins from the six other fights on the card, including champion Katie Taylor defending her undisputed women's super-lightweight titles in a rematch against Amanda Serrano.

But now all that's left is the boxing.

Tyson won 50 professional matches during his 20-year career and once stood 37-0 with 33 knockouts. He has not fought professionally since 2005.

Paul, who has seven knockouts, has notched some wins over big names, including ex-MMA stars Anderson Silva, Nate Diaz and Tyron Woodley (twice).

They'll face each other to cap the main card, which starts at 8 p.m. ET on Friday at AT&T Stadium, home of the Dallas Cowboys.