Darth Vader's Rogue One Fury Theory

In the opening of "Star Wars: A New Hope," Darth Vader's unusual anger and aggressive behavior towards the Rebel captain can be attributed to the recent events in "Rogue One." One fan theory explains that having witnessed the Rebels invade Scarif, steal crucial military intelligence, and transfer the plans to the Tantive IV right before his eyes, Vader was infuriated. This blatant act of rebellion was a direct challenge to the Empire, and the Rebel captain's attempt to pass off the ship as a diplomatic vessel on a mission to a distant planet incited Vader's fury. He perceived this explanation as an affront to his intelligence, leading to his uncharacteristic outburst.

This fan theory explains Vader's rare moment of anger as a response to the immediate events he witnessed in "Rogue One," where the Rebels openly defied the Empire, and he was compelled to confront the audacity of the Rebel captain's explanation for the Tantive IV's presence.