LOL, I had that happen with a SWAT team 2 years ago. Heard pounding on the door and scared the shit out of me. Turns out they were going to bust my neighbor and came to my place to position in the back yard without being seen.
The fucked up part I was sound asleep and by the time I got down stairs they thought no one was home and had headed back to the street, so when I opened the door the sound spooked them and they spun around with their fricking weapons pointing at me.
