Breathing lightning

In many fantasy settings and resources, there are creatures capable of, or described as, breathing lightning. How might a creature evolve naturally such that it can emit lightning, or an effect that may be easily mistaken for lightning, from its mouth?

I am intentionally providing no additional expectations or requirements of design in order to not influence answers. Feel free to imagine your creature in any way you see fit, so long as it meets the lightning-breathing requirement.

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Breathing lightning

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