Green Lightning: [IBM] N. 1. Apparently Random Flashing Streaks On The Face Of 3278-9 Terminals While A New Symbol Set Is Being Downloaded.

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:green lightning: [IBM] n. 1. Apparently random flashing streaks on
the face of 3278-9 terminals while a new symbol set is being
downloaded. This hardware bug was left deliberately unfixed, as
some genius within IBM suggested it would let the user know that
`something is happening'. That, it certainly does. Later
microprocessor-driven IBM color graphics displays were actually
*programmed* to produce green lightning! 2. [proposed] Any
bug perverted into an alleged feature by adroit rationalization or
marketing. "Motorola calls the CISC cruft in the 88000
architecture `compatibility logic', but I call it green
lightning". See also {feature} (sense 6).
-- The AI Hackers Dictionary