There must be a herd of elephants living upstairs

I hate for this to become a rant blog, but at this point I'm so irritated that I have to share my frustration somehow. My upstairs neighbors (a 20-something couple) are very nice, but they're ridiculously loud. And I think it's unintentional, which makes it difficult to complain to them. They're just loud, and I don't think they realize how loud they are. They're all about slamming the doors when they come and go. Apparently, just shutting the door is impossible; it has to be slammed really, really hard to make sure that it actually closes. Which is not a problem that I have when I come and go... And it's almost as if they're intentionally stomping when they walk up and down the stairs. This isn't just a normal tread; they are incredibly loud! It lasts from them walking up the stairs to their floor, to them walking around inside their apartment. And finally, why is it that it always sounds like they're remodeling furniture up there? It doesn't matter what time of the day or night, but it constantly sounds like they're moving the largest pieces of furniture in their apartment around all the time. Like now, for example. I find it amazing (and thoroughly infuriating) that two people can make such an extraordinary amount of noise and not realize it.