On Wednesday, Johnny Depp will bring to a Los Angeles judge an issue that could wreak havoc across Hollywood. The star actor recently settled his big lawsuit against his former management firm, but he’s still in court with the lawyer who negotiated most of his work for the past two decades. That would be Jake Bloom, whose other clients include Jerry Bruckheimer, Nicolas Cage, Ron Howard and Martin Scorsese. Depp alleges that he and Bloom have been together since 1999 on basically a handshake basis, and that without a written contract, he’s entitled to recover more than $30 million in fees. And if the actor succeeds, Depp’s lawyer Adam Waldman quite legitimately predicts it could render void decades of similar handshake agreements across the industry. But will Depp prevail?