Two well-known YouTubers, Logan Paul and KSI, are planning a boxing fight at Manchester Arena in August 25.
The YouTube stars held the event with fans in London's York Hall on Wednesday, ostensibly to trade barbs before their big fight.
Paul walked out of a press conference intended to drum up publicity for the event because KSI insults his girlfriend and family. "Apparently you only have 85% of your testicle," said KSI at one point.