Has anybody ever had this happen to them?

Okay, so you know when the same thing has happened to you over and over again, such as somebody cutting you off, somebody walking ridiculously slowly infront of you, oblivious that you are behind them, something that annoys you? But everytime you don't say anything and then one day when your patience is wearing thin, you say or do something rude/mean/annoying and the person you end up freaking out on is the nicest person ever? LOL, might be random but this has happened to me before and I always hate it. WBU?