Given notice, and been escorted out, despite having been practically loved by the entire department.
Given notice, been asked to stay two months, stayed, and regretted it because of the unreasonable work load added, and the stress involved, with no real compensation.
Just outright quit and walked-out, because the company had a rep for escorting people out that gave notice, so screw them, I needed two months off just to recover from having worked for them for two years anyway.
Didn't give notice, but took another full-time job in another industry entirely, without telling either employer, and it worked out awesome despite the stress, because the first employer went into Chapter 11 not a month later, and when they did, EVERYBODY just quit, rendering staying mote.
Started my own company, gave notice, was asked to stay longer, asked for some incentive to stay the period they requested (4 months), they refused to negotiate at all, I offered 4 weeks instead, and was locked-out without notice the very next day. Which only bothered me because of the commute that day to a non-existent job, which turned out really cool because I picked-up a new client in the same complex as I sat in a coffee shop there and overheard some guys talking about needing help NOW and not knowing where to turn.
One job I had for 6 months I quit over the phone after a 4 day cooling off period after the employer attempted to get me to sign a document assuming responsibility for a criminal incident that happened at a college campus facility my only involvement with was to daily pick up paperwork. They actually fabricated documents to make it look like I was the on-duty supervisor there, and when I went out in the car and produced MY copies of MY daily paperwork, which I kept, which they'd forgot they gave me permission to have, they backed-down. At that point, though, I knew I was dealing with a company that was basically a criminal organization - oddly enough they were a bay area security company !
In every situation I was genuinely nice (with an effort), despite often wanting to cuss. But I've been working since I was 15, and had a lot of time to watch and listen.