Radiohead's Karma Police is good if the boss/corporate have been particularly dickish to you but it's a little slow.
I'm going to have to go with big Sean's "I Don't **** With You" feat. E-40
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the video takes the theme of a HS athlete finding out his gf is actually the GF of his main rival and it affects his game. But once he shakes the feelings off and sees her in the crowd he uses winning to rub it in her face.
Sort of how when you leave a job for something better