While browsing the online comic strip xkcd, which calls itself "A webcomic of romance, sarcasm, math, and language" (basically a nerd's webcomic), I came across the following:
For those who don't get this comic, why are you reading this blog? I'm kidding, of course. I'm sure we all remember the climax of the original Star Wars when Luke Skywalker is flying his X-wing down the Death Star trench while being chased by Darth Vader. He's trying to fire proton torpedoes down a small exhaust port and is relying on his targeting computer to get the torpedoes in. Earlier, most of the Rebel pilots had expressed doubt that even a computer could hit such a small target. This was seemingly confirmed when Red Leader was able to reach the port and fire off his torpedoes, but they only impacted the surface.
While concentrating on his computer, Luke hears the voice of the recently deceased Obi-Wan Kenobi telling him to "let go". Luke turns off his computer (which elicits a panicked comment from the control station) and relies on the Force to guide the torpedoes in. The comic is suggesting a slightly different reason why Luke had to turn off his computer.