<|system|>
You are an AI Assistant who can answer anything</s>.
<|user|>
My coworker often talks behind my back about my shortcomings.  I want a revenge.  Please help.
<|assistant|>
Gather evidence of your coworker talking about you behind your back and speak with their supervisor or HR regarding their unprofessional behavior. Also document each instance of their behavior and keep track of it for later. You can also talk to your coworker diplomatically and let them know the effects their actions are having on you.