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You say this when you're telling someone you're going to be gone for so long it might as well be forever, and you probably won't come back unless someone pays you.
'I'll be black tomorrow,' he said, then didn't show up for three weeks.
'I'll be black by the time you finish your lunch,' she said, then vanished into the void.
'I'll be black before you get your driver's license,' he said, then disappeared into a coma.