I burned myself out at a startup about 20 years ago. Walked into my bosses office & told him I quit. Was on the other side of the planet a few days later. I did eventually return home though.
Last job, they fired the boss I liked but let him hang out on the payroll for 3 months. Since he was also cool with me, I put in 3 weeks vacation and he approved it immediately. (Apparently I'm not the only one who did this.)
Came back, told my new boss this is my last week, basically did nothing the entire week.