What conclusion to draw?

Let me first state: I live in a good neighborhood. Nothing too scary, fairly middle class. With that, I am a bit alarmed by the activities of my downstairs neighbors. Last night I heard a lot of bumping around and something close to a crash. Then I heard their front door open and close. I looked out my window and saw their refrigerator sitting on the front lawn. Ya'll, I live in an apartment. Generally the fridge stays in the apartment at all times. 10 minutes later the refrigerator was back in the apartment. Bizarre behavior? Yes. I watch a lot of Dog the Bounty Hunter and I have decided they are running a meth lab. Maybe some of their concoction spilled inside and they took it out to clean it. Sure, meth lab seems a little like jumping to conclusions, but I don't have the most patience for this neighbor to begin with. I have to listen to her amorous encounters at least two times a week (her bedroom is right above mine and quiet she is not), listen to the hacking coughing that comes from them smoking pot (I can smell it outside the door when I'm walking Teddy), and the loud television watching - I can actually hear distinct dialogue through the wall. I am going to be so pissed if I get blown up by their home chemistry experiments.