Okay, so the screen cap doesn't really do this one justice and I couldn't find an audio clip. It's the detonation effect of the Slave I's "sonic charge" weapon. So awesome.
What I love about this effect (in addition to its just being very, very cool) is that it takes one of the old standby Star Wars nitpicks—no sound in space!—and throws it right back in spoilsport pedantic nerds' faces. Too bad there's no sound in space because it would rule.
The site where I found the image even has a great pseudo-scientific description of the physics behind why the bomb sounds the way it does. You see, it creates "an explosion so cosmic that the energy of the sound is unable to escape at the time of ignition, but is released a moment later."
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