Writing a resignation letter is never easy. You're either really pissed off at the organisation/the boss/the culture/the colleagues and you could pen a thousand-word letter on why everything sucks, or you've had a good run and now all the bittersweet feels are welling up as you mentally take a walk down memory lane. Or perhaps you fall somewhere in between the two.
Whatever the case, this guy's experience was certainly an unforgettable one.