I'm a lousy neighbor...

This morning, my rental office called and said the neighbors below me complained that it sounded like I was throwing weights around or something. The truth of the matter is that I've been clearing out my 2nd bedroom all afternoon and was setting some books on the book case in my bedroom when the shelf in the case suddenly shifted. That can't be good, I thought. All of a sudden, two shelves of books came crashing down on top of me and it was all I could to to hold the rest of the bookcase up. What I should have done was empty the rest of the case and taken care of it in the morning. However, I was tired and grumpy at having had some rather heavy art books fall on me and so my first instinct was to fix it. So I did. Tearing up some cardboard, I wedged it under the front of the case so it would have a natural back tilt. I then grabbed my hammer and stud finder and resecured the bookcase to the wall with a Thud, Thud Thud. I suddenly heard a reply of Thump, thump, thump coming from the floor below me. I figured it was a neighbor irritated with my hammering. I thought, wonder what they're so uptight about as I turned and looked at the clock. Oh. I had been so busy with the work that I had completely lost track of time. It was just shy of midnight. I, of course, felt like an inconsiderate dufus. In the future, should a shelf of books fall on me, I will look at the clock before grabbing my hammer.