The letter ‘K’ is the single most infuriating response that a man can receive from a woman in any sort of electronic communication. Its purpose is clear. As a man, if this sole letter (dis)graces your inbox, it is NEVER a good thing. It means you fucked up, she’s having an episode of inexplicable irrationality over something, or some combination of the two. Guys, if you see this letter in response to something you said, you have options. Run and hide, start apologizing profusely (probably for something you didn’t even know you did), or grab your balls and stand up for yourself. Goodnight, and good luck.