When I tried to quit my job at a call centre for a bank, it didn't work. I had only been working there a few months, and had already taken a week off for a family reunion. I was offered a chance to go to Hawaii for 2 weeks, and get paid well for just a few hours of work. Well, not really work, juggling.
I knew they wouldn't let me off, so I found another job to start when I returned. I went to the call centre and told my boss I was quitting. She ushered me into her office, and asked why. I said I had found another job, working in a bank branch. She asked how much more they were going to pay me. In reality, I was taking a pay cut, but I told her $1.50 more an hour. She said she didn't want me to quit, that I was in line for a promotion, and to hang on, she wanted to go talk to her boss.
I sat there for about 10 minutes, and when she came back, she said they were prepared to offer me more than the branch job, plus a promotion. I said that's nice, but since I had secured this other job, I had arranged to go to Hawaii for 2 weeks, and couldn't change those plans.
She excused herself, and when she came back a few minutes later, I had secured a pay increase, a promotion, and 2 weeks paid holidays, which I hadn't earned yet.
To this day, I'm sure that there is no way this would have happened, if I had tried to manipulate the situation. I'm still not sure how it happened. But, sometimes quitting is the best way to get ahead.