Check out this slow-motion video of lightning. You can see how the burst of energy searches for the best path to the ground, and once it finds it, sticks to exactly that path for several milliseconds. The last few seconds of this video are not a single still frame - it's the bolt holding to the path it found.
A bolt of lightning is powerful enough to generate x-rays, and heats the surrounding air hotter than the surface of the sun. Hot air expands: when this super hot air collapses after the bolt leaves the premises it creates the deep rumble of thunder.
No, it's not really the devil beating his wife.
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