In his recent new autobiography, Jenson Button has revealed that he found Lewis Hamilton "a bit weird" when they were teammates at McLaren.
Although Button believes the world championship leader is one of the all-time greats of the sport, he has opened up on the strange relationship the pair had.
He explained: “As people, we had a lot in common. There was our shared karting history, not to mention the fact that his dad was a customer of my dad," as per BBC Sport.
“And, unlike a lot of drivers in Formula 1, neither of us came from an especially wealthy background; we'd achieved what we had through talent and a lot of grafting.
“When we spent time together it was nice, and he'd always strike up a conversation with dad, and we'd hang out a bit.
“But at the same time there were an awful lot of awkward and uncomfortable silences, and often I'd think: ‘What's going unsaid here?’”
He added: “He's built on all that talent and hard work and he's a more rounded character as a result.”
Button says he was warned by several people about joining McLaren because of Hamilton's talent and the way the team was perceived to be focused on him.
But the 37-year-old believes his arrival at McLaren with his entourage of close friends and his father changed the atmosphere, and that Hamilton feared it undermined his position with the team.
He added: "Personally, he was fine with me, no issues at all at this stage of the game, but you could just tell he was a little bit peeved.
"That thing about it being his team? It was right on the money. And, if you ask me, he was finding it difficult to get a handle on the fact that it was our team now."
Hamilton has been in superb form again this season and holds a 59 point lead over Ferrari rival Sebastian Vettel.
The Briton can actually win the 2017 world championship this weekend at the United States Grand Prix if he outscores Vettel by 16 points or more.
After that, the season concludes with races in Mexico, Brazil and Abu Dhabi. Mercedes also lead Ferrari in the constructors' championship by a massive 145 points