[thoughaway]

For a former landlord, I left a one-star review on yelp and also gave them a piece of my mind over the phone. They're maybe the largest property manager in my city and would significantly limit my ability to rent.

I also left a one star review, created a mock twitter account, and berated the staff of a local, crooked towing company run by former police officers.

At a financial company, I reported my co-worker to the authorities due to a sensitive new project, his erratic behavior, and his public history of financial crimes somehow unknown to my superiors/HR.

At another job, I told my boss I hated my job just about every week for a few months (in so many words). Then I quit. Maybe that should have burned a bridge but he seemed happy that I basically was giving him a heads up, and I also delivered the project I was on before leaving.