To become an internet sensation you naturally have to have an air of confidence about you.
Well, KSI and Logan Paul have proven beyond doubt that they can talk big and showed they are not afraid to swap the verbal barbs for physical blows when they fought to a unanimous draw in an amateur bout in August 2018.
This time, the warring duo will square off in the professional boxing ranks in a much-hyped rematch at Los Angeles' Staples Center on Saturday.
An online rivalry that was borne out of KSI calling out fellow YouTube stars after defeating Joe Weller has escalated to a world-wide scale, with a reported 60 million witnessing their first contest.
Before the gloves come on, we have taken a look at some of the best taunts and comments from their heated rivalry. It's fair to say neither man pulled any punches…
I CAN'T WAIT TO SEE YOUR BLOODY FACE ALL OVER THE INTERNET!
The first contest between the duo ended in a draw, but the fighting talk continued almost immediately after.
"I think we have to have a rematch. Let's do it, that was fun! I can't wait to see your bloody face all over the internet," KSI taunted.
Paul concurred replying: "I think that's what the people want. Let's give them a rematch."
I CAN'T WAIT TO SEE THE MEMES AFTER I'VE BEATEN THE LIFE OUT HIM!
Fittingly for YouTube stars, KSI used a quip that will have landed well with the internet generation, albeit with some pretty gruesome additions.
"I can't wait to see the memes of him slumped on the ground after I've repeatedly beaten the life out of him. He's facing a different animal this time. He will soon realise," he said in September.
I'M DRINKING THE BLOOD OF COWS!
Paul said he was going through some pretty extreme measures ahead of the rematch.
"They're making a machine out of me," Paul told Business Insider.
"I'm eating 80lbs a day. I'm drinking the blood of cows and I'm pushing a lot of weights up in the air and putting them down."
I'M GOING TO MAKE YOU MY B****!
Paul was greeted to some rather unsavoury chants at a UK media conference in October and was typically inflammatory with his words.
"The difference in this fight is I'm going to win! I didn't know what I was doing last time – I'm going to make KSI my b**** and turn him into a meme on November 9!" He said.
THERE'S NO RESPECT…
Any idea that, despite the heat of battle, underneath it all is a underlying mutual respect was quashed by KSI.
He said: "There is no respect there for Logan Paul and I can't wait to finish him off! In the last fight I was able to see his strengths and weaknesses and all his credibility is going to go out the window! I have the power, he doesn't!"
I'M SPARRING PROS AND BEATING THEM BADLY!
Say what you like about either man there is no lack of confidence, as proven by this line from Paul.
"I am sparring professional fighters and I am beating them badly. That does so much for my confidence," he claimed.
"I relied on my athleticism to carry me through the first fight and it almost worked."