Hey, revenge may be sweet, but only for a moment. Later you will regret doing anything. Getting revenge is not only immature, but it brings you down to their level. You need to move on. You might not be able to use your old boss as a reference, but it sounds like you have experience working at an office, and should be able to get a good, if not better job. If your friend rubs it in your face that you quit, you will be able to show her that you have another job, and don't really need your old job or boss. That is more effective than real revenge, and you will have a lot of confidence in yourself!