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3. Robert Downey Jr and Terrence Howard
Robert Downey Jr and Terrence Howard co-starred in the original Iron Man movie back in 2008. However, when Iron-Man 2 was in the works, the two actors publicly fell out due to money issues. Terrence claimed that Robert asked for more money forcing the producers to cut him off and eventually costing him millions of dollars. Originally, Marvel signed Terrence for 3 films before dramatically cutting his salary to have enough money for Robert. Although Terrence was pissed off with the quick turn of events, he has since mended ways with Robert arguing that life is too short to keep grudges.