1st big boy job and quit after about 7 years: Handed in a one sentence resignation letter like Richard Nixon. Told them there's nothing you can do to make me stay, and my boss is a colossal toxic bitch.
2nd job: Entire site was getting shut down but we all knew it was happening like 6 months ahead of time. So around Noon on the 'day' a meeting notice went out about the mass layoff, I picked up the phone and accepted the offer for my replacement job, then we went out to Islands and got shit faced. Came back to the office and it was like a party, lol. Food, drinks, free shit, doors wide open, nobody giving a shit, only thing you had to do is turn in your laptop but you were free to come and go. It was great.
3rd job: Waited exactly 2 years before searching for a new job since I fulfilled obligations from the relocation package, and when I accepted the new offer at the new company I immediately did the one sentence resignation thing at like 3PM on a Tuesday, then proceeded to the bar where we all got shitfaced.