This was at a Major Electronics Vendor that is known internationally and who produces... "Entertainment devices".
He walked up to his boss, handed his letter of resignation in, and was told "No, you're too critical to this project, I can't accept this." His response was to say "If I'm too critical to this project then you have failed in your duties as a manager, and it would be very inconvenient for you to have to admit that, so you're going to let me go or I'll make it Very Inconvenient for you by telling the whole team you think they're idiots and that the foreigner is the only reason this release will succeed."
He then didn't show up for a month (new job gave him enough time to take a nice, lengthy 3-month vacation to Korea and back) and his old boss kept calling and sms'ing him... On a number he only used for that job.