I remember a place that asked me to sign a "exit agreement" with all sorts of ridiculous things on it, but did not offer a severance or any other kind of incentive for me to sign it. Had a good chuckle at that one. They insisted I couldn't leave until I signed it, and looked kind of confused when I said how about I just not come in the next day, or the day after, etc. They asked that they get some time to figure out how they were going to deal with that scenario...