I've been a cop in Brazil for 20 years. A couple of years ago, a coworker had a stroke and died right inside the precinct. He was a heavy smoker, and soon after his death, strange things started happening.
Cabinets and doors began shaking and slamming. The handles moved on their own, sometimes for several hours non-stop. It wasn't just me who noticed; most of the cops saw and heard the same things. We even asked the Captain, a devout Catholic, to bring in a priest to exorcise the precinct. He refused and called me crazy, but the evidence was there for anyone to see. We kept the windows closed, so it couldn't have been the wind causing all this.
The cleaning lady said she could still smell his cigar sometimes. One night, the disturbances kept me up until 4 AM. I couldn't sleep because of all the noise and that heavy, oppressive presence. Suddenly, I heard him breathing heavily, just like he did in the last stages of his life as a smoker. The sound lasted for about 20 seconds.
That was the last time we experienced anything like that, and thank God for it. The eerie incidents stopped, but the memory of those unsettling nights stayed with us. It felt like he had finally found peace, and so did we.