HR setup an exit interview that was meant to be anonymous. Asked questions about improving the department. I took it seriously I was direct in my feedback thinking that I was helping my coworkers have a better workplace in the future and helping the company identify potential issues. I was wrong. HR immediately gave my feedback to the boss because the HR person and my boss were friends. Nothing changed in the department but I created an enemy with someone whom I had a good working relationship with. Lesson learned.
If asked to give an exit interview just say everything was great, you are sad to go, but are pursuing a great opportunity that you can't turn down. 99 percent of the time your honest direct feedback will do nothing to improve a situation and only burn a bridge for you.