They are action-hero veterans and business partners who once joined forces to flog burgers through their Planet Hollywood chain.
But now Sylvester Stallone has branded his fellow ageing film star Bruce Willis lazy and a failure, after the Die Hard actor departed from the lucrative Expendables franchise.
Willis had been in negotiations to reprise his role as the CIA agent Mr Church in the third instalment of The Expendables, Stallone's all-star throwback to the 1980s action movies, which the Rambo star once dominated at the box office.
But Stallone, 67, announced via Twitter, with some glee, that Willis, 58, would now not be returning: WILLIS OUT HARRISON FORD IN !!!! GREAT NEWS !!!!! Been waiting years for this!!!! Stallone appeared to twist the knife by telling the world that his former screen partner in the first two Expendables was, indeed, expendable. GREEDY AND LAZY ... A SURE FORMULA FOR CAREER FAILURE, he tweeted moments later.
A spokesman for Stallone, who co-wrote and directed the first outing of The Expendables in 2010, confirmed the actor had been talking about his old colleague but refused to comment further. Willis has yet to respond.