#2. Sumner Redstone and David Geffen
After Redstone's Viacom purchased Geffen's Dreamworks Studios in 2006 for $1.6 billion, there should have been peace in moguldom. Dreamworks, the studio founded by Geffen, Steven Spielberg and Jeffrey Katzenberg, delivered a string of hits Dreamgirls, Blades of Glory, Transformers and Viacom's Paramount Pictures ably marketed and distributed them. But Dreamworks execs, reportedly experiencing sellers' remorse, felt Paramount was taking credit for their successes. High-net-worth backbiting ensued. Things really got ugly when a Viacom exec told investors that losing Spielberg would be "completely immaterial" to his corporation. It may sound mild, but in Hollywood this is tantamount to calling Mother Teresa a little bit loose.
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