One day I was leaving the office and there was one other developer left. He was a much older guy (like in his 70’s – great C++ developer) and he was cleaning his keyboard, having many of the keys already removed. Unfortunately he had a chat window focused with one of our remote developers at the time, so there was all these random keystrokes sent as chat messages over the last few minutes. He hadn’t noticed that the other developer was frantically asking if he was OK, or if he should call the paramedics. Since the keyboard was missing keys he couldn’t respond, so I went back to my desk and explained things to this remote developer. It was quite funny after the fact.
That is why I always make sure I have notepad focused when I clean my keyboard.