For those who raised their digital hand, here is an important lesson you must learn if you want to succeed in your career: Every person you work with, whether they are a coworker, a boss, or an employee, will, at some point, forget or deny something you discussed about work. You might have been talking about a certain task, a deadline, or even your own compensation. It doesn't matter how good your working relations are; one day they will decide to deny the conversation ever happened.
When that day comes, you have to be prepared. Any conversation that seems even remotely important to you must be accompanied by receipts. That means that you must either hold the entire conversation in a clearly documented messaging system, or follow up any verbal conversation with a written summary that the other party must confirm. Sure, it must sound like more work; it might even seem pointless to you, but stories like the ones below prove that it's not. In fact, documentation like that is very likely to save your job.