I stood on all of that and it worked for a second. But then I had the tips of my fingers on the vase, and the tragedies started to wobble, and the tuxedo was incredibly distracting, and the next thing was that everything was on the floor, including me, and including the vase, which had shattered. "I didn’t do it!" I hollered, but they didn’t even hear me, because they were playing music too loud and cracking up too much. How does the narration shape Oskar’s characterization in this excerpt?