Throughout the Dark Knight trilogy.
First was The Dark Knight stands as not only the best of the trilogy but one of the best superhero movies ever made, and it’s still making way for different interpretations and theories, as it left a couple of mysteries and loose ends.
Among the many things Bruce Wayne/Batman had to deal with in The Dark Knight was his identity being exposed, especially when an employee of Wayne Enterprises, Coleman Reese (Joshua Harto), found information that linked the company to Batman. Reese was an M&A law ant at Wayne Enterprises who found some numerical irregularities due to the Applied Sciences division’s sudden disappearance, and after investigating more, he found the blueprints for the Tumbler. After explaining all this to Lucius Fox (Morgan Freeman), Reese demanded $10 million per year for life in exchange for his silence. Lucius and the audience immediately understood that Reese found out Bruce was Batman, but a fan theory suggests it was actually Lucius Fox who gave it away.
A theory posted on Bruce Wayne/Batman but against Wayne Enterprises, and the reveal of Bruce being Batman made him realize he didn’t really think his plan through. In addition to that, Reese didn’t threaten to expose Bruce when talking to Fox, and it was only when the Joker started creating chaos around Gotham that he attempted to do so, as he now knew it was Bruce thanks to Fox.
This theory on when Reese knew Bruce Wayne was Batman in The Dark Knight actually makes sense as he truly never made a reference to Bruce or him being Batman, instead focusing on how Wayne Enterprises had been investing in the vigilante and building stuff for him, even asking Fox “what are you building for him now? a rocket ship?” – and had he known Bruce was Batman, he surely wouldn’t have made those demands as he clearly knew what both could do to him, and he only threatened to expose him on TV in an attempt to save Gotham City. There are many moments throughout the Dark Knight trilogy like this one that are understood in one way but might be hiding something else, and that’s what makes revisiting these movies so exciting and interesting.