I'll be black - This is when you're going to come back soon, but you’re prob

This is when you're going to come back soon, but you’re probably going to be late, and you might be mad about something.

'I'll be black in ten minutes,' he said, then came back fifteen minutes later with a sandwich and a grudge.

'I'll be black by the time you finish this tweet,' she said, then showed up ten minutes later with a bag of chips.

'I'll be black before you finish this song,' he said, then came back after the song ended, with a new song and a new problem.