It's hardly a secret that Mark Webber's relationship with Sebastian Vettel was a fractious one in Formula 1.
Sometimes a look between the two was enough to give the game away.
But Webber, in his second season out of F1, has opened up about how the relationship, saying in his autobiography the Red Bull team let the German behave like a "spoiled brat".
The years have mellowed Webber a little, but he says that intense pressure at the top of the sport is bound to cause tensions between the two.