As Errol Spence and Terence Crawford get ready for Saturday's megafight, the makings of another intriguing matchup were being produced backstage during the Crawford/Spence weigh-ins. 

A viral video is now circulating of Caleb Plant slapping Jermall Charlo in the face after an apparent verbal altercation turned physical. The flush slap drew gasps from those around to witness it. While the two boxing stars appeared to want to take things further, security managed to keep things calm. 

While it remains unclear what sparked the altercation, but Plant could be heard yelling "Don’t you ever grab me by my motherf****in' face again like that, boy," as the two were separated. 

Source: twitter.com