<|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|>
There are a few things you could try. You could talk directly to your coworker and express your feelings to try and reach a solution, or, you could document every instance of gossiping so that you have proof and speak to a supervisor to address the problem. You could also choose to ignore it, or talk to someone else in the office about it to see if they have any advice or suggestions.