I've only experienced a quitting coworker once.

In a previous job a coworker quit with the words directed to the boss in a very loud and aggressive manner: "Ich künde, du verfiggti pissmorchle!!!"*, while throwing around office chairs and swearing all kinds of nasty stuff.

My boss at that time was indeed a fucking wanker. He exploited the shit out of every employee and expected from us that we work overtime for free. No pauses were paid, eventhough he'd had to by law.
I don't have to mention that he was a sexist fucktard and 3 female ex-employees sued him for sexual assault.
Sadly he is still in charge of that wanker company and he "miraculously" dodged every "bullet".

* trigger-safely and roughly translated to: "I quit, you fucking wanker!!!"

Context: Working in a small IT department of an SME that sells wine during my uni placement year.

Having the MD come into the office cubicle without notice or even knocking and always expecting people to work long hours (when his dad was more of a _work efficiently 3h per day_ type of person) and not hold his promise on getting me to work on projects relevant to my degree and the initial contract (where I was also paid less than promised).