> In the case of quitting your job, I'm not sure it applies since what you really want to do is to leave. If you have a good relationship with your team and company, by all means be generous with your time. Otherwise, I don't think you'll get much value out of being overly considerate of your old company.

The # of times I've encountered people from my past is staggering.

No reason to needlessly anger people, especially if leaving a good impression just takes a wee bit more effort.