It won't happen again
The phrase that people say to their boss when they know that they have fucked up and their boss has yelled at them at them. This is the acceptable response apart from "sorry" that should be used when apologising to a boss. The harshness of the reason can vary from being late to
shredding a
court case report. The result is always the same, the accused, embarrassed and
flustered, the boss, pissed off, saying "it better not" and the rest of the workers staring at the accused.